CN116765172A - Method for controlling deflection of H-shaped steel web - Google Patents
Method for controlling deflection of H-shaped steel web Download PDFInfo
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- CN116765172A CN116765172A CN202310618297.7A CN202310618297A CN116765172A CN 116765172 A CN116765172 A CN 116765172A CN 202310618297 A CN202310618297 A CN 202310618297A CN 116765172 A CN116765172 A CN 116765172A
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- straightening roller
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003825 pressing Methods 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for controlling deflection of an H-shaped steel web, which belongs to the technical field of steel production and comprises the following steps: (1) Measuring the actual thickness and deflection of the web of the H-shaped steel before straightening the rolled piece, and measuring the thickness t of the web 1 Web deflection w; (2) zero adjustment is carried out on the straightening roller; (3) Setting roll gap depression values of the upper rolls 2, 4, 6 and 8 after zero calibration is completed; (4) straightening the rolled piece by a straightening machine. Compared with the prior art, the method has the characteristics of rapidness, convenience and reliability.
Description
Technical Field
The invention discloses a method for controlling deflection of an H-shaped steel web plate and a division application of a straightening tool (2021101199760) used by the method, relates to the technical field of steel, and particularly relates to a method for controlling deflection of an H-shaped steel web plate by improving the straightening tool and the technology of hot rolled H-shaped steel.
Background
The hot rolled H-shaped steel has good section economy and is widely applied to industries such as construction industry, mechanical industry, bridge manufacturing industry and the like. When the H-shaped steel is used, the H-shaped steel generally relates to the processing technologies such as butt welding, assembling and the like, so that the requirements on the appearance shape and quality of a finished product are high.
In large-specification H-shaped steel, the conditions of large bending (deflection) of the web are easy to occur after rolling due to factors such as large height of the web, thin relative thickness of the web, rapid cooling and the like. The rolled piece needs to be corrected in the straightening process. In the national recommended standards, web deflection (W) requirements: the height H is less than 400mm, and W is less than or equal to 2.0mm; the height H is more than or equal to 400mm and less than 600mm, and the W is less than or equal to 2.5mm; the height H is more than or equal to 600mm, and the W is less than or equal to 3.0mm. Along with the higher and higher requirements of terminal customers on the product quality, the web deflection requirements of the customers on the product are higher than the national recommended standard, and the deflection of all specifications required by part of customers is less than or equal to 2mm and exceeds the national standard requirement.
The basic process flow of hot rolling H-shaped steel is as follows: continuous casting blank, heating, high-pressure water descaling, BD roughing mill, finish rolling unit continuous rolling, cooling by a cooling bed, straightening, sawing, checking and bundling. Wherein the straightening process is the most direct process for adjusting deflection of the hot rolled H-shaped steel. The straightening roller sets of the straightener in the prior art are formed by staggered combination of 9 straightening roller sets, namely four upper straightening roller sets and five lower straightening roller sets, wherein the vertical position of the lower straightening roller is kept unchanged, and the upper straightening roller is adjusted by vertical pressing. Each straightening roller set is formed by assembling two straightening roller sleeves through a straightening roller mandrel, and is a two-roller type straightening roller set. When the rolled piece is straightened, the two-roller straightening roller set mainly acts on the R angle of the section steel, and the section steel web is reversely bent for multiple passes, so that the section steel is locally deformed in an elastoplastic mode and work hardened, the straightened state of the product reaches the standard requirement, and the product is kept straight and does not rebound.
However, for large H-shaped steel (the height is more than or equal to 70 mm), such as H700X 300-H900X 300, the large deflection of the web plate is easy to occur in the cooling process after rolling due to the large height of the web plate. When the conventional two-roll straightening roll works, as the roll mainly presses down the R angle of the flange and the web, the highest deflection point of the web is positioned at the center line of the web, and the force application point is far away from the middle part, the deflection of the web is slightly improved, and particularly, the deflection is difficult to correct under the condition of large deflection.
Disclosure of Invention
The technical task of the invention is to provide a method for controlling the deflection of the H-shaped steel web, aiming at the defects in the prior art, and the deflection of the large-specification hot-rolled H-shaped steel web is controlled by improving a straightening roller set and a straightening pressing process.
The technical scheme for solving the technical problems is as follows: a method for controlling deflection of an H-steel web, characterized by: the method comprises the following steps:
(1) Measuring the actual thickness and deflection of the web of the H-shaped steel before straightening the rolled piece, and measuring the thickness t of the web 1 Web deflection w;
(2) Zero adjustment is carried out on the straightening roller;
(3) Setting roll gap depression values of the upper rolls 2, 4, 6 and 8 after zero calibration is completed;
(4) The rolled piece is rectified by a straightener.
Further, according to the pressing amount of the upper roller 2, the upper rollers 4, 6 and 8 are set in a descending manner.
Further, the upper 2-roll pressing amount N 2 The upper rollers 4, 6 and 8 are in accordance with the coefficient N 4/6/8 ＝k·N 2 The setting is decremented.
Further, k=0.5 to 0.95.
In the optimization scheme, after the first branch is straightened in the step (4), measuring various bending indexes of the section steel, checking web deflection, and adjusting according to the actual straightening state.
A straightening tool for controlling deflection of H-shaped steel webs is characterized in that: the device comprises nine straightening roller sets which are combined in a staggered way, wherein the upper straightening roller set is four, and the lower straightening roller set is five; the four upper straightening roller sets are two-roller type straightening roller sets, each two-roller type straightening roller set comprises a straightening roller mandrel and two straightening roller sheets, and the two straightening roller sheets are positioned at two ends of the straightening roller mandrel; the three-roll straightening roller set comprises a straightening roller mandrel and three straightening roller sheets, wherein the straightening roller sheets are respectively positioned at the two ends and the middle of the straightening roller mandrel.
In the three-roller type straightening roller set, the diameter of the middle straightening roller sheet is 0.1-0.5mm larger than that of the straightening roller sheets at two sides.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the improved straightening roller set generates a direct force application point to the middle part of the web through the middle roller, so that the middle part of the web longitudinally bends, the deflection of the web is effectively improved, the straightening bent steel is reduced, the product yield is improved, and the customer satisfaction is improved;
2. the pressing procedure is improved, the design of the process piece is improved, the adjustment is qualified and quick, the adjustment of the original large-specification word needs 40 minutes, the adjustment needs 30 minutes after the improvement, and the process is stable;
3. according to the annual output with the height of more than or equal to 700mm, the deflection failure rate of the web plate before improvement is 0.5 percent, the deflection failure rate after improvement is reduced to 0.1 percent, 1600 tons of bent steel can be reduced annually, and the benefit is 130 tens of thousands.
Drawings
FIG. 1 is a schematic top view of a straightening roll set of a prior art straightener.
Fig. 2 is a schematic diagram of a prior art two-roll straightening roll structure and point of application.
FIG. 3 is a schematic top view of the leveler roll set of the leveler of the present invention.
Fig. 4 is a schematic view of a three-roll straightening roll structure and a point of application of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
The roll straightener mainly utilizes multi-pass reverse bending through straightening roller groups which are arranged in an up-down staggered way, so that when a rolled piece passes through a process channel formed by the straightening rollers, elastic plastic deformation is locally generated, and the rolled piece is subjected to work hardening, so that the rolled piece is straightened.
The straightening roller sets of the straightener in the prior art are formed by staggered combination of 9 straightening roller sets, namely four upper straightening roller sets and five lower straightening roller sets, wherein the vertical position of the lower straightening roller is kept unchanged, and the upper straightening roller is adjusted by vertical pressing. As shown in fig. 2, each straightening roller set is formed by assembling two straightening roller sheet sleeves through a straightening roller mandrel, and is a two-roller type straightening roller set. The traditional two-roller straightening roller set is commonly adopted due to the advantages of simple assembly and the like. When the two-roller straightening roller set works, the roller sheets mainly act on the R angle of the flange and the web, and the highest point of the web deflection is positioned at the center line of the web. For the situation that the deflection of the web is large, if the reverse bending of the two sides is too small, the deflection of the web cannot be improved; the reverse bending of the two sides is too large, which may cause microcrack at the R angle and even the situation of car crack. The large-specification H-shaped steel (the height is more than or equal to 700 mm) has the specification of H700 multiplied by 300 to H900 multiplied by 300, the condition of large deflection of the web plate easily occurs in the cooling process after rolling due to large height of the web plate, and the effect of large deflection of the web plate is not obvious when the traditional two-roller straightening roller set is adopted for straightening the web plate.
As shown in figures 3 and 4, the straightening roller set is formed by staggered combination of nine straightening roller sets, four upper straightening roller sets and five lower straightening roller sets, wherein the vertical position of each lower straightening roller is unchanged, and the deflection of an H-shaped steel web plate is adjusted by vertical pressing of each upper straightening roller.
The four upper straightening roller sets are two-roller type straightening roller sets 3, each two-roller type straightening roller set 3 comprises a straightening roller mandrel 1 and two straightening roller sheets 2, and the two straightening roller sheets 2 are positioned at two ends of the straightening roller mandrel 1.
The three-roll straightening roll set 4 comprises a straightening roll mandrel 1 and three straightening roll sheets 2, wherein the straightening roll sheets 2 are respectively positioned at the two ends and the middle of the straightening roll mandrel 1. As the direct force application point is added in the middle of the web 4 of the H-shaped steel, the part with the largest web deflection is effectively acted, and the part is bent reversely relative to the original state, thereby improving the web deflection. When the large-size H-shaped steel is straightened, the web deflection can be well improved without excessive pressing.
The other purpose of the three-roller straightening roller position design is to facilitate the rolled piece to smoothly bite into the straightener, and avoid the middle larger deformation caused by the action of the middle straightening roller, and the design enables the middle 3 straightening roller sets to adopt three rollers in the lower 5-roller straightening roller set. Because the lower roller is unchanged in position, when the upper roller is pressed down, the middle 3 straightening rollers are three rollers, and in the four reverse bending process, the three rollers act on the middle part of the web in a pressing manner, and act on the point with the largest deflection. In order to achieve the improvement effect, the diameter of the middle roller is designed to be 0.1-0.5mm larger than the diameters of the rollers at the two sides according to the specification characteristics. In order to ensure the straightening accuracy, the assembly accuracy of the straightening roller set is less than or equal to 0.3mm.
The deflection of the web plate of the H-shaped steel is generally downward bending, so that the bending is obviously improved, and the web plate is downward bent before a rolled piece enters a straightener by turning steel through a steel turning machine to achieve a better improvement effect for the specification of part of the upward bending.
The invention is characterized in that the corresponding pressing regulation is adjusted by modifying the combination mode of the straightening roller set of the straightener, so that large-specification H-shaped steel with deflection meeting the requirement can be stably produced, bending steel in the straightening process is reduced, the purposes of improving the product quality and the product yield are achieved, and the invention has high social and economic benefits.
The method for adjusting the corresponding pressing rules in the method for controlling the deflection of the H-shaped steel web comprises the following steps:
1. measuring the actual thickness and deflection of the web of the H-shaped steel before straightening the rolled piece, and measuring the thickness t of the web 1 Web deflection w;
2. zero adjustment is carried out on the straightening roller;
3. after zero calibration is completed, roll gap rolling values of the upper rolls 2, 4, 6 and 8 are set so as to avoid indentation in the middle of the web.The technical proposal adopts a small reduction procedure for reduction, and the reduction of the upper 2 rolls is carried out according to N2= (k) 1 ·t 1 ·σs/E+k 2 W), where k 1 、k 2 Is the upper 2-roller reduction coefficient, t 1 For the actual web thickness measured before correction, σs is the actual yield strength of the steel, E is the elastic modulus of the steel, and w is the actual web deflection measured before correction; the upper rollers 4, 6 and 8 are in accordance with the coefficient N 4/6/8 ＝k·N 2 (k=0.5 to 0.95) decreasing setting;
4. straightening the rolled piece through a straightening machine;
in the optimization scheme, after the first branch is straightened, measuring various bending indexes of the section steel, checking web deflection, and adjusting according to the actual straightening state.
The parameter data for three specification embodiments are shown in the following table:
it is noted that while the present invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made therein without departing from the spirit and scope thereof.
Claims (5)
1. A method for controlling deflection of an H-steel web, characterized by: the method comprises the following steps:
(1) Measuring the actual thickness and deflection of the web of the H-shaped steel before straightening the rolled piece, and measuring the thickness t of the web 1 Web deflection w;
(2) Zero adjustment is carried out on the straightening roller;
(3) Setting roll gap depression values of the upper rolls 2, 4, 6 and 8 after zero calibration is completed;
(4) The rolled piece is rectified by a straightener.
2. The method of controlling deflection of an H-section steel web of claim 1 wherein: the upper rollers 4, 6 and 8 are set in a descending manner according to the pressing amount of the upper roller 2.
3. The method of controlling deflection of an H-section steel web of claim 2 wherein: the upper 2-roll pressing amount N 2 The upper rollers 4, 6 and 8 are in accordance with the coefficient N 4/6/8 ＝k·N 2 The setting is decremented.
4. A method of controlling deflection of an H-section steel web as claimed in claim 3 wherein: k=0.5 to 0.95.
5. The method of controlling deflection of an H-section steel web of claim 1 wherein: and (3) after the first branch is straightened in the step (4), measuring various bending indexes of the section steel, checking the deflection of the web, and adjusting according to the actual straightening state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310618297.7A CN116765172A (en) | 2021-01-28 | 2021-01-28 | Method for controlling deflection of H-shaped steel web |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310618297.7A CN116765172A (en) | 2021-01-28 | 2021-01-28 | Method for controlling deflection of H-shaped steel web |
| CN202110119976.0A CN112845682A (en) | 2021-01-28 | 2021-01-28 | Method for controlling deflection of H-shaped steel web and straightening tool used by method |
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| CN202110119976.0A Division CN112845682A (en) | 2021-01-28 | 2021-01-28 | Method for controlling deflection of H-shaped steel web and straightening tool used by method |
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| CN116765172A true CN116765172A (en) | 2023-09-19 |
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| CN202310618297.7A Pending CN116765172A (en) | 2021-01-28 | 2021-01-28 | Method for controlling deflection of H-shaped steel web |
| CN202110119976.0A Pending CN112845682A (en) | 2021-01-28 | 2021-01-28 | Method for controlling deflection of H-shaped steel web and straightening tool used by method |
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| CN114309074B (en) * | 2021-12-27 | 2024-01-02 | 马鞍山钢铁股份有限公司 | Straightening process and straightening structure of section steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5060498A (en) * | 1990-08-28 | 1991-10-29 | Kawasaki Steel Corporation | Section steel straightener with adjustable roller width |
| CN101791639A (en) * | 2010-04-08 | 2010-08-04 | 莱芜钢铁集团有限公司 | Section steel straightening roller device and assembly method |
| CN102886394B (en) * | 2011-07-19 | 2014-10-29 | 宝山钢铁股份有限公司 | Tension straightening method and device for wide and thick sheet metal straightener |
| CN104162560B (en) * | 2014-07-07 | 2017-03-15 | 太原科技大学 | Two-roll straightening inclination angle and roll gap technological parameter determine method |
| CN105689450B (en) * | 2016-01-27 | 2017-10-20 | 燕山大学 | A kind of roller continuous straightening device of large straight seam three and process |
| CN210936553U (en) * | 2019-10-21 | 2020-07-07 | 河北津西钢板桩型钢科技有限公司 | Asymmetric section steel straightener |
| CN215089898U (en) * | 2021-01-28 | 2021-12-10 | 日照钢铁控股集团有限公司 | Straightening roller set suitable for large-specification H-shaped steel |
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