CN112845682A - Method for controlling deflection of H-shaped steel web and straightening tool used by method - Google Patents
Method for controlling deflection of H-shaped steel web and straightening tool used by method Download PDFInfo
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- CN112845682A CN112845682A CN202110119976.0A CN202110119976A CN112845682A CN 112845682 A CN112845682 A CN 112845682A CN 202110119976 A CN202110119976 A CN 202110119976A CN 112845682 A CN112845682 A CN 112845682A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005452 bending Methods 0.000 claims abstract description 36
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 238000007373 indentation Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 11
- 238000001816 cooling Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005098 hot rolling 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
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000007514 turning 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
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- 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
Abstract
The invention discloses a method for controlling the 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 plate of the H-shaped steel before the rolled piece is straightened, and measuring the thickness t1 of the web plate and the bending value w of the web plate; (2) adjusting the zero position of the straightening roller; (3) after the zero calibration is completed, setting the roll gap pressing values of the upper 2, 4, 6 and 8 rollers to avoid the indentation in the middle of the web. The method is carried out by adopting a small reduction rule, the reduction of the upper 2 rollers is set according to the condition that N2 is equal to (k1, t1, sigma s/E + k2, w), and the upper 4 rollers, the upper 6 rollers and the upper 8 rollers are gradually reduced according to the coefficient that N4/6/8 is equal to k.N 2(k is equal to 0.5-0.95); (4) and straightening the rolled piece through a straightening machine. Compared with the prior art have swift convenient and reliable characteristics.
Description
Technical Field
The invention relates to the technical field of steel, in particular to a method for controlling the deflection of a web plate of H-shaped steel by improving a straightening tool and a straightening process for hot-rolling the H-shaped steel.
Background
The hot-rolled H-shaped steel has good section economy and is widely applied to the industries such as the building industry, the machinery industry, the bridge manufacturing industry and the like. When the H-shaped steel is used, the processing technologies such as butt-joint welding, assembly and the like are generally involved, so that the requirement on the appearance shape and quality of a finished product is high.
In large-specification H-shaped steel, the rolled piece is easy to have the condition of large bending degree (deflection) of the web plate after rolling due to the factors of large height of the web plate, thin relative thickness of the web plate, quick cooling and the like. The rolled piece needs to be straightened in the straightening process. In the national recommendations, the requirement for web bow (W): the height H is less than 400mm, and W is less than or equal to 2.0 mm; the height H is more than or equal to 400mm and less than 600mm, and W is less than or equal to 2.5 mm; the height H is more than or equal to 600mm, and the W is less than or equal to 3.0 mm. With the increasing requirements of terminal customers on the product quality, the requirements of customers on the bending degree of a web plate of a product are actually higher than the national recommended standard, and part of customers require that the bending degree of all specifications is less than or equal to 2mm and exceeds the national standard.
The basic process flow of hot rolling H-shaped steel comprises the following steps: continuous casting blank → heating → high pressure water descaling → BD roughing mill → finishing mill group continuous rolling → cooling bed cooling → straightening → sawing → inspection and bundling. Among them, the straightening step is the most direct step of adjusting the degree of bending of the hot-rolled H-section steel. The straightening roll group of the straightening machine in the prior art is formed by combining 9 straightening roll groups in a staggered manner as shown in figure 1, wherein four upper straightening roll groups and five lower straightening roll groups are arranged, and the lower straightening rolls keep the vertical positions unchanged and are vertically pressed down and adjusted through the upper straightening rolls. Each straightening roller group is formed by assembling two straightening roller sleeves through a straightening roller mandrel, and is a two-roller straightening roller group. When a rolled piece is straightened, the two-roller straightening roller group mainly acts on the R-angle part of the section steel, and the section steel web plate is reversely bent for multiple times, so that the section steel locally generates elastic-plastic deformation and work hardening, the straightened state of the product reaches the standard requirement, and the straightened state is kept straight without rebounding.
However, for large-sized H-shaped steel (the height is more than or equal to 70mm) such as H700 multiplied by 300-H900 multiplied by 300 specifications, the bending degree of the web is easy to appear in the cooling process after rolling due to the large height of the web. When the conventional two-roller type straightening roller works, the roller mainly presses the R corners of the flange and the web, the highest point of the bending degree of the web is positioned at the center line of the web, and the force application point is far away from the middle part, so that the improvement on the deflection of the web is small, and the web is difficult to correct particularly 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 web plate of the H-shaped steel, aiming at the defects of the prior art, and the bending degree of the web plate of the large-specification hot-rolled H-shaped steel is controlled by improving a straightening roll set and a straightening pressing process.
The technical scheme for solving the technical problem is as follows: a method for controlling the deflection of a web plate of H-shaped steel is characterized by comprising the following steps: the method comprises the following steps:
(1) measuring the actual thickness and deflection of the web plate of the H-shaped steel before the rolled piece is straightened, and measuring the thickness t1 of the web plate and the bending value w of the web plate;
(2) adjusting the zero position of the straightening roller;
(3) after the zero calibration is completed, setting the roll gap pressing values of the upper 2, 4, 6 and 8 rollers to avoid the indentation in the middle of the web. The technical scheme is characterized in that the reduction is carried out by adopting a small reduction rule, the reduction of the upper 2 rollers is set in a descending manner according to the factor N2(k 1. t 1. sigma. s/E + k 2. w), and the upper 4 rollers, the upper 6 rollers and the upper 8 rollers are set in a descending manner according to the factor N4/6/8 (k. N2 (k. 0.5-0.95));
(4) and straightening the rolled piece through a straightening machine.
In the optimization scheme, after the first support is straightened in the step (4), various bending indexes of the section steel are measured, the bending degree of the web plate is checked, and the adjustment is carried out according to the actual straightening state.
The utility model provides a straightening instrument of control H shaped steel web deflection which characterized in that: the straightening device comprises nine straightening roller groups which are combined in a staggered mode, four upper straightening roller groups and five lower straightening roller groups; the four upper straightening roller groups are two-roller straightening roller groups, each two-roller straightening roller group comprises a straightening roller core shaft and two straightening roller sheets, and the two straightening roller sheets are positioned at two ends of the straightening roller core shaft; two of the two ends of the five lower straightening roller sets are two-roller straightening roller sets, the middle three of the five lower straightening roller sets are three-roller straightening roller sets, each three-roller straightening roller set comprises a straightening roller mandrel and three straightening roller sheets, and the straightening roller sheets are respectively positioned at the two ends and the middle of the straightening roller mandrel.
In the three-roller straightening roller group, the diameter of the middle straightening roller sheet is 0.1-0.5mm larger than the diameter 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 group generates a direct force application point to the middle part of the web plate through the middle roller, so that the middle part of the web plate longitudinally generates reverse bending, the bending degree of the web plate is effectively improved, straightening bent steel is reduced, the product yield is improved, and the customer satisfaction is improved;
2. the pressing procedure is improved, the design improvement of a process part is matched, the qualified adjustment is quicker, 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 of the specification with the height of more than or equal to 700mm, the curvature unfinalization rate of the front web plate is improved by 0.5 percent, the curvature unfinalization rate of the rear web plate is improved by 0.1 percent, 1600 tons of bent steel can be reduced in an year, and the benefit is generated by 130 tens of thousands.
Drawings
FIG. 1 is a schematic top view of a straightener roll group of a prior art straightener.
FIG. 2 is a schematic diagram of a two-roll straightening roll structure and a force application point in the prior art.
FIG. 3 is a schematic top view of a straightener roll group of the leveler of the present invention.
Fig. 4 is a schematic diagram of the structure and point of application of the three-roll straightening roll of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The roller type straightener mainly utilizes multi-pass reverse bending through the straightening roller sets which are arranged in a vertically staggered mode, so that when a rolled piece passes through a process channel formed by the straightening rollers, elastic-plastic deformation is generated locally, the rolled piece is hardened in a machining mode, and the rolled piece is straightened.
The straightening roll group of the straightening machine in the prior art is formed by combining 9 straightening roll groups in a staggered manner as shown in figure 1, wherein four upper straightening roll groups and five lower straightening roll groups are arranged, and the lower straightening rolls keep the vertical positions unchanged and are vertically pressed down and adjusted through the upper straightening rolls. As shown in FIG. 2, each of the straightening roll groups is formed by assembling two straightening roll sheet sleeves through straightening roll mandrels, and is a two-roll straightening roll group. The traditional two-roller type straightening roller group is generally adopted due to the advantages of simple assembly and the like. When the two-roller straightening roller group works, the roller sheet mainly acts on the R-shaped angle between the flange and the web, the highest point of the bending degree of the web is positioned at the center line of the web, and the bending degree of the web is improved only by the reverse bending at two sides because the highest point of the bending degree of the web is lack of a direct force application point. For the condition that the deflection of the web plate is large, if the reverse bending of the two sides is too small, the deflection of the web plate cannot be improved; the two sides are bent reversely too much, which may cause microcracks and even saloon cracks at the R corner. The large-size H-shaped steel (the height is more than or equal to 700mm) is as in H700 multiplied by 300-H900 multiplied by 300 specifications, the condition of large bending degree of the web is easy to occur in the cooling process after rolling due to the large height of the web, and the effect of straightening the large bending degree of the web by adopting the traditional two-roll straightening roll group is not obvious.
As shown in FIGS. 3 and 4, the straightening roller group of the invention is formed by combining nine straightening roller groups in a staggered manner, four upper straightening roller groups and five lower straightening roller groups, wherein the vertical position of each lower straightening roller is kept unchanged, and the deflection of the web of the H-shaped steel is adjusted by vertically pressing down each upper straightening roller.
The four upper straightening roller groups are two-roller straightening roller groups 3, each two-roller straightening roller group 3 comprises a straightening roller core shaft 1 and two straightening roller sheets 2, and the two straightening roller sheets 2 are positioned at two ends of the straightening roller core shaft 1.
Two of the two ends of the five lower straightening roller sets are two-roller straightening roller sets 3, the three middle of the five lower straightening roller sets are three-roller straightening roller sets 4, each three-roller straightening roller set 4 comprises a straightening roller mandrel 1 and three straightening roller sheets 2, and the straightening roller sheets 2 are respectively positioned at the two ends and the middle of the straightening roller mandrel 1. As the direct force application point is added in the middle of the web plate 4 of the H-shaped steel, the direct force application point effectively acts on the part with the maximum bending degree of the web plate, so that the part is reversely bent relative to the original state, and the bending degree of the web plate is improved. When large-size H-shaped steel is straightened, the bending degree of the web plate can be well improved without excessive pressing.
The position design of the three-roller straightening roller aims to facilitate a rolled piece to be smoothly bitten into the straightening machine and avoid larger middle deformation caused by the action of the middle straightening roller, and three rollers are adopted in the middle 3 straightening roller groups in the lower 5 straightening roller groups. Because the position of the lower roller is unchanged, when the upper roller is pressed down, the middle 3 straightening rollers are three rollers, and in the four-time reverse bending process, the middle rollers of the three rollers are pressed down to act on the middle part of the web plate and act on the point with the maximum bending degree. 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 two sides according to the specification characteristics. In order to ensure the straightening accuracy, the assembly accuracy of the straightening roller group is less than or equal to 0.3 mm.
The bending degree of the web plate of the H-shaped steel is generally downward bending, so that the bending is obviously improved, and for the specification of partially generating upward bending, the steel can be turned by a steel turning machine, so that the web plate is bent downward before a rolled piece enters a straightening machine, and a better improvement effect is achieved.
The method is characterized in that the large-size H-shaped steel with the bending degree meeting the requirement can be stably produced by modifying the combination mode of the straightening roller set of the straightening machine and adjusting the corresponding pressing rule, the bent steel in the straightening process is reduced, the purposes of improving the product quality and the product yield are achieved, and the method has very high social and economic benefits.
The method for adjusting the corresponding pressing rule in the method for controlling the deflection of the web of the H-shaped steel comprises the following steps:
1. measuring the actual thickness and deflection of the web plate of the H-shaped steel before the rolled piece is straightened, and measuring the thickness t1 of the web plate and the bending value w of the web plate;
2. adjusting the zero position of the straightening roller;
3. after the zero calibration is completed, setting the roll gap pressing values of the upper 2, 4, 6 and 8 rollers to avoid the indentation in the middle of the web. The technical scheme is characterized in that the reduction is carried out by adopting a small reduction rule, the reduction of the upper 2 rollers is set in a descending manner according to the factor N2(k 1. t 1. sigma. s/E + k 2. w), and the upper 4 rollers, the upper 6 rollers and the upper 8 rollers are set in a descending manner according to the factor N4/6/8 (k. N2 (k. 0.5-0.95));
4. straightening the rolled piece through a straightening machine;
in the optimization scheme, after the first support is straightened, various bending indexes of the section steel are measured, the curvature of the web plate is checked, and the adjustment is carried out according to the actual straightening state.
The parameter data for the three specific examples of specifications are shown in the following table:
it should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. A method for controlling the deflection of a web plate of H-shaped steel is characterized by comprising the following steps: the method comprises the following steps:
(1) measuring the actual thickness and deflection of the web plate of the H-shaped steel before the rolled piece is straightened, and measuring the thickness t1 of the web plate and the bending value w of the web plate;
(2) adjusting the zero position of the straightening roller;
(3) after the zero calibration is completed, setting the roll gap pressing values of the upper 2, 4, 6 and 8 rollers to avoid the indentation in the middle of the web. The method is carried out by adopting a small reduction rule, the reduction of the upper 2 rollers is set according to the condition that N2 is equal to (k1, t1, sigma s/E + k2, w), and the upper 4 rollers, the upper 6 rollers and the upper 8 rollers are gradually reduced according to the coefficient that N4/6/8 is equal to k.N 2(k is equal to 0.5-0.95);
(4) and straightening the rolled piece through a straightening machine.
2. The method for controlling the deflection of a web of H-beam steel according to claim 1, wherein: and (4) after the first support is straightened in the step (4), measuring various bending indexes of the section steel, checking the bending degree of the web plate, and adjusting according to the actual straightening state.
3. The utility model provides a straightening instrument of control H shaped steel web deflection which characterized in that: the straightening device comprises nine straightening roller groups which are combined in a staggered mode, four upper straightening roller groups and five lower straightening roller groups; the four upper straightening roller groups are two-roller straightening roller groups, each two-roller straightening roller group comprises a straightening roller core shaft and two straightening roller sheets, and the two straightening roller sheets are positioned at two ends of the straightening roller core shaft; two of the two ends of the five lower straightening roller sets are two-roller straightening roller sets, the middle three of the five lower straightening roller sets are three-roller straightening roller sets, each three-roller straightening roller set comprises a straightening roller mandrel and three straightening roller sheets, and the straightening roller sheets are respectively positioned at the two ends and the middle of the straightening roller mandrel.
4. The straightening roll group suitable for large-sized H-shaped steel according to claim 3, wherein: in the three-roller type straightening roller group, the diameter of the middle straightening roller sheet is 0.1-0.5mm larger than the diameter of the straightening roller sheets at two sides.
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| 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 |
| CN202310618297.7A CN116765172A (en) | 2021-01-28 | 2021-01-28 | Method for controlling deflection of H-shaped steel web |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309074A (en) * | 2021-12-27 | 2022-04-12 | 马鞍山钢铁股份有限公司 | Straightening process and straightening structure of profile steel |
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2021
- 2021-01-28 CN CN202310618297.7A patent/CN116765172A/en active Pending
- 2021-01-28 CN CN202110119976.0A patent/CN112845682A/en active Pending
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| CN116765172A (en) | 2023-09-19 |
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Application publication date: 20210528 |