CN112872027A - Novel rolling process for large H-shaped steel - Google Patents
Novel rolling process for large H-shaped steel Download PDFInfo
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- CN112872027A CN112872027A CN202011568646.1A CN202011568646A CN112872027A CN 112872027 A CN112872027 A CN 112872027A CN 202011568646 A CN202011568646 A CN 202011568646A CN 112872027 A CN112872027 A CN 112872027A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 238
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 230000002441 reversible effect Effects 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
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Abstract
The invention provides a novel rolling process of large H-shaped steel, wherein a roughing mill set adopts innovative two-roller or universal combined hole type three-frame reversible continuous rolling, and a finishing mill set adopts universal combined hole type three-frame reversible continuous rolling and finished product single-frame head-off tension-free rolling. The novel rolling process is suitable for rolling large H-shaped steel and can be used for producing ultra-large H-shaped steel, heavy H-shaped steel, light and thin H-shaped steel and other large-scale deformed steel products; by adopting the rolling process, the production adjustment is flexible and convenient, the load distribution of the rolling mill is more uniform in the rolling process, the total rolling pass is reduced, the temperature of a rolled piece is reduced, the metal deformation is more uniform, the web eccentricity is small, the product quality is high, the roller consumption is low, the production line efficiency can be obviously improved, and the ton steel rolling cost can be reduced.
Description
Technical Field
The invention belongs to the technical field of hot rolled steel, and particularly relates to a novel rolling process of large H-shaped steel.
Background
The H-shaped steel is used as a green energy-saving section bar, and is rapidly developed and popularized in China in recent 20 years, the large H-shaped steel is gradually and widely applied to the construction of the industrial field of China due to good mechanical property and excellent section parameters, particularly, the policies such as large H-shaped steel planning for assembly type buildings, highway bridges and railway bridges advocated by the nation in recent years provide better policy guidance for the development of the large H-shaped steel, and the development of the large H-shaped steel is bound to meet the high trend of application, and the production of the large H-shaped steel in specialization and scale is bound to be the development trend.
In the field of large H-shaped steel production lines, a rolling mode of '1 + 3' is adopted at present at home and abroad, namely a rough rolling two-roller reversible rolling mill and a three-stand reversible continuous rolling finishing mill group (a finishing mill group UR universal mill, a finishing mill group E edger and a finishing mill group UF universal mill respectively)
When the arrangement form of 1+3 is adopted, 2-3 passes are generally arranged on the roughing mill body of the two-roll reversible roughing mill, each pass needs to be reversibly rolled for multiple passes, the roughing mill also needs to carry out 1-2 passes of vertical rolling on the blank under the condition that the width of the blank is not proper, the roll gap adjustment time of the mill is long during the vertical rolling, the rolling period is long, and the blank needs to be turned over by 90 degrees during the vertical rolling, so that the rolling period is increased. In addition, the roughing mill has a long roll body, the rolling reduction and the rolling force of the rolling mill cannot be too large, the rolling efficiency of the roughing mill is limited, and the excellent processing characteristics of the rolled piece at a high-temperature stage cannot be fully exerted.
The two-roller reversible roughing mill cannot process the flange thickness of a rolled piece, so that the flange thickness of the rolled piece can only be processed on a following finishing three-rack reversible continuous rolling mill unit, on one hand, the number of rolling passes of the finishing three-rack reversible continuous rolling mill unit is large (generally 5-7 passes, and 9 passes are adopted in large specification), on the other hand, the increase of the flange thickness of a blank is limited, the meter weight of a special-shaped blank is relatively small, and in order to improve the productivity and yield, the length of the special-shaped blank needs to be lengthened, so that the width of a heating furnace is increased, and the investment is increased.
When the arrangement form of 1+3 is adopted, for the finishing mill group,
when the 'X-H' pass method is used for rolling, the 'H' pass is used as a finished pass and needs to participate in multi-pass reversible rolling, after the side wall of the pass is worn, the surface quality of a finished product cannot be guaranteed, roll replacement operation is needed, the operation rate of a rolling mill is reduced, meanwhile, after the side wall of the 'H' pass is worn, the width of the pass cannot be basically repaired, the width of a roll can only be reduced within the tolerance range of the finished product, and when the width of the roll is reduced to the deviation under the width standard of the finished product, the roll can only be used for rolling small-specification products, and the consumption.
Aiming at the above constraints of the traditional 1+3 arrangement form for rolling large H-shaped steel, a novel rolling process is developed, and the rolling process can realize the breakthroughs in the following aspects:
1) and three rough rolling units capable of realizing reversible continuous rolling are adopted to realize simultaneous processing of the waist thickness and the flange thickness of the blank on the rough rolling units.
2) When the rolled piece is in a high-temperature state, the mode of reversible continuous rolling of three rough rolling racks is utilized, three racks participate in rolling in each pass, the good deformation characteristic of the rolled piece in a high-temperature stage is fully utilized, large reduction rolling is carried out on the blank, the rolling efficiency is greatly improved, and the temperature drop of the rolled piece is reduced.
3) And the roller body of the roughing mill set is short, and compared with a conventional two-roller reversible roughing mill, the bending stress of the roller neck part and the groove bottom part is low, so that the rolling roll breakage risk is reduced.
5) The roughing mill group can adopt a waist expanding rolling method to roll a large blank, can also adopt a universal mill to roll the width of a web plate to roll a small blank, has wide blank application range, avoids the mode of large-opening vertical rolling of a conventional two-roller reversible mill, reduces the large stroke adjustment time and the steel turnover time of a screw-down screw, and accelerates the rolling rhythm.
6) The roughing mill group universal mill participates in rolling, the roll shaft of the roll is a forged steel roll, the strength is high, the roll collar is a semi-steel roll, the wear resistance is high, the problems that the roll is seriously worn due to the difference of the linear speeds of all points in the diameter direction of the pass and the roll is heavily turned due to the small inclination of the side wall of the pass when the pass is rolled are avoided, and the utilization rate of the roll is improved.
7) The finishing mill group adopts the form of reversible rolling of three rolling mills and end-off rolling of a finished product single stand, and the reversible rolling pass system of the three stands is as follows: universal hole type + universal control hole type + universal hole type. The inclination of the side surface of the horizontal roll and the inclination of the roll surface of the vertical roll of the two universal hole types are both 95 degrees, the heavy turning amount is small after the rolls are worn, the hole types are easy to recover, the consumption of the rolls is greatly reduced, the end part and the thickness of the flange of the rolled piece are simultaneously processed while the web of the rolled piece is processed by the universal control hole type, the symmetry degree of the flange of the rolled piece is ensured, and the capacity of the rolling mill is fully exerted. The finished product frame adopts single frame head-off rolling, the hole type system is a universal hole type system, the side surface of the horizontal roller and the roll surface of the vertical roller are both 90 degrees, finished products are rolled in one time, the influence of tension between frames on the size of a rolled piece is avoided, the size precision of the rolled piece is easier to control, the abrasion of a finished product roller is small, and the surface quality of the rolled piece is high.
Disclosure of Invention
In view of the above, the invention aims to provide a new rolling process for large H-section steel, so as to solve the problems that a rolled piece is rolled on a two-roll reversible roughing mill by using an open type straight pass system, the open type straight pass method cannot process the flange thickness of the rolled piece, only the waist thickness and the flange height of the rolled piece can be processed, and meanwhile, when the blank width is large, the blank needs to be turned by 90 degrees by a tilting machine for vertical rolling.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a novel rolling process for large H-shaped steel comprises the following steps:
s1, heating the steel billet by a heating furnace, and conveying the dephosphorized blank to a rough rolling three-rack unit by a roller way for reversible rolling;
s2, the roughing mill group selects an energy digging mode or a two-roller mill mode as required to roll the blank;
s3, cutting the head and the tail of the intermediate billet rolled by the rough mill group by a hot saw, and then sending the intermediate billet to the finishing mill group for rolling by a roller way;
and S4, after finishing the rolling of the finishing mill group, performing end-off rolling with the finishing mill group through a finishing finished product rolling mill to roll out a finished product.
Further, the phosphorus removal process in step S1 is as follows:
and (3) heating the steel billet to 1250 ℃ by a heating furnace, discharging the steel billet out of the furnace, and removing furnace-generated iron scale generated in the heating process by a high-pressure water descaling device.
Further, the roughing train in the step S2 includes a first universal rolling mill R1, a second universal rolling mill R2, and a third universal rolling mill R3.
Further, the rolling setting process of the roughing train in the step S2 is as follows:
the width of the roll surface of a first universal rolling mill R1 of the roughing mill set is determined according to the width of a blank and a finished product, wherein the inclination of the side surface of the horizontal roll is 5-10 degrees, and the vertical roll adopts a conical surface vertical roll with the inclination of the side surface of 5 degrees;
the inclination of the side surface of a horizontal roll of a second universal rolling mill R2 of the roughing mill set is 5-10 degrees, the inclination is the same as that of the side surface of the horizontal roll of the first universal rolling mill, and the width of the roll surface is determined according to the width of a blank and a finished product;
the inclination of the side surface of the horizontal roll of the third universal rolling mill R3 of the roughing mill set is 5-10 degrees, the inclination is the same as that of the horizontal roll of the first universal rolling mill, and the width of the roll surface is determined according to the width of the blank and the finished product.
Further, the step S4 finishing mill group includes a fourth universal mill UF1, a fifth universal mill UF2, and a sixth universal mill UF 3.
Further, the roll parameters of the finishing mill group rolling mill in the step S4 are set as follows: the side slope of the horizontal roll of the fourth universal rolling mill UF1 is 95 degrees, the slope of the vertical roll surface is 95 degrees, and the setting of the sixth universal rolling mill UF2 is the same as that of the fourth universal rolling mill UF 1.
Further, the fifth universal rolling mill UF2 adopts a universal control hole pattern.
Further, the finishing train rolling mill of step S4 is designed as follows:
the side slope of a horizontal roll of the fourth universal roughing mill UF1 is 5 degrees, and a vertical roll adopts a 5-degree conical surface vertical roll;
the slope of the lateral surface of a horizontal roll of the sixth universal roughing mill UF2 is 5 degrees, and a vertical roll adopts a 5-degree conical surface vertical roll.
Further, the finish rolling mill in the step S4 is designed as follows: the side surfaces of the horizontal rolls and the roll surfaces of the vertical rolls are both 0 degree, and the leg parts of rolled finished products are vertical and form 90 degrees with the waist part.
Compared with the prior art, the novel rolling process for the large H-shaped steel has the following advantages:
(1) in the rolling process, the three-stand reversible continuous rolling is innovatively adopted for rough rolling, the total rolling pass can be increased when large H-shaped steel is rolled, the rolling reduction of each pass is reduced, the length of a roller body is shortened, and the load of a rolling mill is reduced.
(2) The rough rolling universal rolling mill in the rolling process has the function of rolling down in the thickness direction of the flange, reduces the load of the rolling down amount of the universal finish rolling vertical roll, and has more uniform metal deformation.
(3) The universal four-roller combined control hole pattern is innovatively adopted by the roughing mill group in the rolling process, the size of an intermediate blank required by finish rolling can be accurately controlled, the size of the intermediate blank plays a decisive role in whether the product can be successfully rolled, and the universal combined hole pattern can realize the flexible online adjustment of the thickness of a web plate, the thickness of a flange and the height of the flange of the intermediate blank at any time according to the requirements of the finishing mill group. Once the rough rolling two-roller reversible pass method is used for designing and turning the roller, the thickness and the height of the flange cannot be adjusted on line.
(4) In the rolling process, the finishing mill set adopts the universal combined control pass, so that the rolling capacity of the finishing mill set is improved, and the control capacity on the symmetry of a finished web is stronger.
(5) In the rolling process, the finishing mill group adopts end-off rolling at the last pass, and single-pass forming is adopted, so that the abrasion of the surface of the roller of the last stand rolling mill is reduced, the roller changing frequency of the roller is reduced, the productivity is improved, and the surface quality of a product is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a system diagram of a pass system of a large H-shaped steel rolling process according to an embodiment of the invention;
FIG. 2 is a diagram of a conventional large steel rolling pass system according to an embodiment of the present invention;
FIG. 3 is a roll profile of a first stand universal mill R1 according to an embodiment of the present invention;
FIG. 4 is a roll profile of a second stand universal mill R2 according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a UF1 roller pattern of a fourth stand universal rolling mill according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a roll profile of a fifth universal mill UF2 according to an embodiment of the invention;
fig. 7 is a roll profile diagram of a finishing mill UF4 according to an embodiment of the present invention.
Description of reference numerals:
1-1, blank; 1-2, a first universal rolling mill R1; 1-3, a second universal rolling mill R2; 1-4, a third universal rolling mill R3; 1-5, a fourth universal mill UF 1; 1-6 and a fifth universal mill UF 2; 1-7 and a sixth universal mill UF 3; 1-8, finishing rolling finished product mill UF 4; 2-1, blank; 2-2, a rough rolling two-roller reversible rolling mill; 2-3, a universal rolling mill of a finishing mill group UR; 2-4, finishing mill group E edging mill; 2-5, finishing mill group UF universal mill.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 7, a new rolling process for large H-section steel comprises the following steps:
s1, heating the steel billet by a heating furnace, and conveying the dephosphorized blank to a rough rolling three-rack unit by a roller way for reversible rolling;
s2, the roughing mill group selects an energy digging mode or a two-roller mill mode as required to roll the blank;
s3, cutting the head and the tail of the intermediate billet rolled by the rough mill group by a hot saw, and then sending the intermediate billet to the finishing mill group for rolling by a roller way;
and S4, after finishing the rolling of the finishing mill group, performing end-off rolling with the finishing mill group through a finishing finished product rolling mill to roll out a finished product.
The phosphorus removal process in step S1 is as follows:
and (3) heating the steel billet to 1250 ℃ by a heating furnace, discharging the steel billet out of the furnace, and removing furnace-generated iron scale generated in the heating process by a high-pressure water descaling device.
The roughing mill group in the step S2 comprises a first universal rolling mill R1, a second universal rolling mill R2 and a third universal rolling mill R3.
The rolling setting process of the roughing mill set in the step S2 is as follows:
the width of the roll surface of a first universal rolling mill R1 of the roughing mill set is determined according to the width of a blank and a finished product, wherein the inclination of the side surface of the horizontal roll is 5-10 degrees, and the vertical roll adopts a conical surface vertical roll with the inclination of the side surface of 5 degrees;
the inclination of the side surface of a horizontal roll of a second universal rolling mill R2 of the roughing mill set is 5-10 degrees, the inclination is the same as that of the side surface of the horizontal roll of the first universal rolling mill, and the width of the roll surface is determined according to the width of a blank and a finished product;
the inclination of the side surface of the horizontal roll of the third universal rolling mill R3 of the roughing mill set is 5-10 degrees, the inclination is the same as that of the horizontal roll of the first universal rolling mill, and the width of the roll surface is determined according to the width of the blank and the finished product.
The step S4 finishing mill group comprises a fourth universal mill UF1, a fifth universal mill UF2 and a sixth universal mill UF 3.
The roll parameters of the finishing mill group rolling mill in the step S4 are set as follows: the side slope of the horizontal roll of the fourth universal rolling mill UF1 is 95 degrees, the slope of the vertical roll surface is 95 degrees, and the setting of the sixth universal rolling mill UF2 is the same as that of the fourth universal rolling mill UF 1.
The fifth universal rolling mill UF2 adopts a universal control hole pattern.
The step S4 finishing train rolling mill is designed as follows:
the side slope of a horizontal roll of the fourth universal roughing mill UF1 is 5 degrees, and a vertical roll adopts a 5-degree conical surface vertical roll;
the slope of the lateral surface of a horizontal roll of the sixth universal roughing mill UF2 is 5 degrees, and a vertical roll adopts a 5-degree conical surface vertical roll.
The finish rolling mill in the step S4 is designed as follows: the side surfaces of the horizontal rolls and the roll surfaces of the vertical rolls are both 0 degree, and the leg parts of rolled finished products are vertical and form 90 degrees with the waist part.
The specific process is as follows:
the billet is heated to 1250 ℃ by a heating furnace and then discharged, furnace-generated iron scales generated in the heating process are removed by a high-pressure water descaling device, and the descaled billet is sent to a rough rolling three-rack unit by a roller way to be rolled reversibly.
Each rolling mill of the rough rolling three-stand reversible unit can adopt a universal rolling mill mode or a two-roll rolling mill mode according to the process requirements, and the number of the rolling mills can be flexibly selected according to the product yield requirement.
When a typical large H-shaped steel is rolled, the roughing mill set adopts an arrangement form of three universal rolling mills, wherein the middle universal rolling mill adopts a universal control pass, the other two universal rolling mills adopt conventional universal passes, the three rolling mills participate in rolling during each pass, each rolling mill can roll a web and a flange, the universal control pass can also roll the end part of the flange, the centering property of the flange and the web is ensured, and the middle blank profile is accurately controlled.
The width of the roll surface of a first universal rolling mill R1 of the roughing mill set is determined according to the width of a blank and a finished product, wherein the inclination of the side surface of the horizontal roll is 5-10 degrees, and the vertical roll adopts a conical surface vertical roll with the inclination of the side surface of 5 degrees;
the inclination of the side surface of a horizontal roller of a second universal rolling mill of the roughing mill set is 5-10 degrees, the inclination is the same as that of the side surface of the horizontal roller of the first universal rolling mill, the width of the roller surface is determined according to the width of a blank and a finished product, when the blank with smaller width is used for rolling the finished product with larger width, the width of the roller surface of the horizontal roller of the second universal rolling mill is larger than that of the roller surface of the first universal rolling mill, so that the waist expanding treatment is carried out, and under the condition that the blank is proper, the width of the roller surface of the horizontal roller of the second universal rolling mill can be equal to;
the second rolling mill universal rolling mill adopts a universal control hole pattern, so that the side surface of the horizontal roll is provided with a boss so as to press down the web of a rolled piece and the height of a flange at the same time, the centering property of the web relative to the flange of the rolled piece in the rough rolling stage is ensured, and the vertical roll adopts a conical surface vertical roll with the side surface inclination of 5 degrees;
the inclination of the side surface of a horizontal roller of a third universal rolling mill of the roughing mill set is 5-10 degrees, the inclination is the same as that of the side surface of the horizontal roller of the first universal rolling mill, the width of a roller surface is determined according to the width of a blank and a finished product, when the blank with smaller width is used for rolling the finished product with larger width, the width of the roller surface of the horizontal roller of the third universal rolling mill is larger than that of the roller surfaces of the first universal rolling mill and the second universal rolling mill for waist expanding treatment, and under the condition that the blank is proper, the width of the roller surface of the horizontal roller of the third universal rolling mill can be equal to that of the roller surface of the first universal rolling mill for improving the sharing of the horizontal roller, and the vertical roller adopts a;
the roughing mill group rolls the rolled piece for 3-5 times (since three rolling mills in each time participate in rolling, the total rolling time is 9-15 times), the smooth gripping of the blank during the first rolling is considered, the first universal rolling mill mainly rolls the rolled piece web plate and expands the waist of the rolled piece in the first time, after the rolling of the three rolling mills in the first time is completed, a certain tongue is formed at the head and the tail of the rolled piece, and the web plate and the flange can be rolled with large reduction in the subsequent times.
When the width of the blank is small and the roughing mill group is required to perform waist expanding rolling, the widths of the horizontal rollers of the first frame rolling mill R1, the second frame rolling mill R2 and the third frame rolling mill R3 of the roughing mill group are sequentially increased, the waist expanding of a rolled piece is formed during rolling along the rolling direction, and the waist expanding amount is determined according to the relation between the blank and a finished rolled piece; when the rolling is carried out in the reverse rolling direction, non-pressing areas appear on two sides of the waist, and the non-pressing areas of the part are eliminated by pressing down the waist in the rolling direction next time.
When the vertical rolls of the universal control hole type of the second universal rolling mill roll the flange of the rolled piece, non-pressing-down areas on the upper side and the lower side of the flange appear, and the partial areas are eliminated when the vertical rolls of the front universal rolling mill and the rear universal rolling mill are pressed down.
And after the head and the tail of the intermediate billet rolled by the roughing mill set are cut by a hot saw, the intermediate billet is sent to a three-stand reversible continuous rolling mill set by a roller way for rolling, and the rolled piece is rolled by a finish rolling reversible continuous rolling mill set for 3-5 times.
In the finishing mill group, roll parameters of a first universal rolling mill UF1 and a sixth universal finishing mill UF3 of the three-stand reversible continuous rolling mill group are the same (the width of a horizontal roll is the same, the side slope of the horizontal roll is 95 degrees, and the slope of the vertical roll surface is 95 degrees); the middle fifth universal rolling mill UF2 adopts a universal control hole type.
The finish rolling finished product mill UF4 rolls off the head of a finish rolling unit (a finish rolling three-stand reversible continuous rolling unit), has no influence of continuous rolling relation on the size of a rolled piece, and ensures that the external dimension of a finished product is accurately adjusted.
In the finishing three-stand reversible continuous rolling unit, the inclination of the side surface of a horizontal roller of a fourth universal roughing mill UF1 is 5 degrees, a vertical roller adopts a 5-degree conical vertical roller, so that the rolled piece can be pressed down conveniently, the heavy turning rate of the roller is improved, the inclination of the side surface of a horizontal roller of a sixth universal finishing mill UF3 is 5 degrees, the vertical roller adopts 5 degrees, the roll types are completely consistent with the roll types of UR1 horizontal rollers and vertical rollers, and the interchangeability of the roller is improved. The middle fifth universal rolling mill UF2 adopts a universal control hole pattern to ensure the centering of flanges and webs, and simultaneously, the thicknesses of the webs and the flanges are pressed down to give full play to the capacity of the rolling mill, and rolled pieces adopt an X-X rolling process in a finish rolling three-stand reversible continuous rolling unit.
The side surfaces of a horizontal roller and a vertical roller of a finished product rolling machine UF4 in a finishing mill group are both 0 degree, and the leg parts of a rolled finished product are vertical and form a 90 degree angle with the waist part.
And rolling the rolled piece by a rough rolling reversible unit set R1, R2 and R3, a finish rolling reversible unit set UF1, UF2 and UF3 and a finish rolling final frame UF4 to produce a qualified hot finished product.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A novel rolling process of large H-shaped steel is characterized by comprising the following steps:
s1, heating the steel billet by a heating furnace, and conveying the dephosphorized blank to a rough rolling three-rack unit by a roller way for reversible rolling;
s2, the roughing mill group selects an energy digging mode or a two-roller mill mode as required to roll the blank;
s3, cutting the head and the tail of the intermediate billet rolled by the rough mill group by a hot saw, and then sending the intermediate billet to the finishing mill group for rolling by a roller way;
and S4, after finishing the rolling of the finishing mill group, performing end-off rolling with the finishing mill group through a finishing finished product rolling mill to roll out a finished product.
2. The novel rolling process of the large-sized H-shaped steel according to claim 1, which is characterized in that: the phosphorus removal process in step S1 is as follows:
and (3) heating the steel billet to 1250 ℃ by a heating furnace, discharging the steel billet out of the furnace, and removing furnace-generated iron scale generated in the heating process by a high-pressure water descaling device.
3. The novel rolling process of the large-sized H-shaped steel according to claim 1, which is characterized in that: the roughing mill group in the step S2 comprises a first universal rolling mill R1, a second universal rolling mill R2 and a third universal rolling mill R3.
4. The new rolling process of large-sized H-shaped steel according to claim 3, characterized in that: the rolling setting process of the roughing mill set in the step S2 is as follows:
the width of the roll surface of a first universal rolling mill R1 of the roughing mill set is determined according to the width of a blank and a finished product, wherein the inclination of the side surface of the horizontal roll is 5-10 degrees, and the vertical roll adopts a conical surface vertical roll with the inclination of the side surface of 5 degrees;
the inclination of the side surface of a horizontal roll of a second universal rolling mill R2 of the roughing mill set is 5-10 degrees, the inclination is the same as that of the side surface of the horizontal roll of the first universal rolling mill, and the width of the roll surface is determined according to the width of a blank and a finished product;
the inclination of the side surface of the horizontal roll of the third universal rolling mill R3 of the roughing mill set is 5-10 degrees, the inclination is the same as that of the horizontal roll of the first universal rolling mill, and the width of the roll surface is determined according to the width of the blank and the finished product.
5. The novel rolling process of the large-sized H-shaped steel according to claim 1, which is characterized in that: the step S4 finishing mill group comprises a fourth universal mill UF1, a fifth universal mill UF2 and a sixth universal mill UF 3.
6. The novel rolling process of the large-sized H-shaped steel according to claim 5, characterized in that: the roll parameters of the finishing mill group rolling mill in the step S4 are set as follows: the side slope of the horizontal roll of the fourth universal rolling mill UF1 is 95 degrees, the slope of the vertical roll surface is 95 degrees, and the setting of the sixth universal rolling mill UF2 is the same as that of the fourth universal rolling mill UF 1.
7. The novel rolling process of the large-sized H-shaped steel according to claim 5, characterized in that: the fifth universal rolling mill UF2 adopts a universal control hole pattern.
8. The novel rolling process of the large-sized H-shaped steel according to claim 5, characterized in that: the step S4 finishing train rolling mill is designed as follows:
the side slope of a horizontal roll of the fourth universal roughing mill UF1 is 5 degrees, and a vertical roll adopts a 5-degree conical surface vertical roll;
the slope of the lateral surface of a horizontal roll of the sixth universal roughing mill UF2 is 5 degrees, and a vertical roll adopts a 5-degree conical surface vertical roll.
9. The novel rolling process of the large-sized H-shaped steel according to claim 1, which is characterized in that: the finish rolling mill in the step S4 is designed as follows: the side surfaces of the horizontal rolls and the roll surfaces of the vertical rolls are both 0 degree, and the leg parts of rolled finished products are vertical and form 90 degrees with the waist part.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114888077A (en) * | 2022-04-29 | 2022-08-12 | 中冶华天工程技术有限公司 | Composite production process for efficiently producing heavy H-shaped steel and steel sheet pile |
| CN115351070A (en) * | 2022-07-29 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Novel rolling method of H-shaped steel |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647201A (en) * | 1979-09-26 | 1981-04-28 | Kawasaki Steel Corp | Method and apparatus for manufacturing shape steel |
| EP0498733A2 (en) * | 1991-02-08 | 1992-08-12 | Sumitomo Metal Industries, Ltd. | Method of rolling steel shapes |
| JP2000334502A (en) * | 1999-05-27 | 2000-12-05 | Sumitomo Metal Ind Ltd | Wide flange shape and its rolling method |
| CN1589983A (en) * | 2003-08-27 | 2005-03-09 | 鞍钢新轧钢股份有限公司 | Short flow path manufacturing method of heavy rail |
| CN110814023A (en) * | 2019-11-13 | 2020-02-21 | 天津市中重科技工程有限公司 | Rolling process of large and super-large section steel in double-reversible finish rolling area |
| CN111468534A (en) * | 2020-04-29 | 2020-07-31 | 山东德坊新材料科技有限公司 | High-strength light H-shaped steel and hot rolling forming process thereof |
-
2020
- 2020-12-25 CN CN202011568646.1A patent/CN112872027A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647201A (en) * | 1979-09-26 | 1981-04-28 | Kawasaki Steel Corp | Method and apparatus for manufacturing shape steel |
| EP0498733A2 (en) * | 1991-02-08 | 1992-08-12 | Sumitomo Metal Industries, Ltd. | Method of rolling steel shapes |
| JP2000334502A (en) * | 1999-05-27 | 2000-12-05 | Sumitomo Metal Ind Ltd | Wide flange shape and its rolling method |
| CN1589983A (en) * | 2003-08-27 | 2005-03-09 | 鞍钢新轧钢股份有限公司 | Short flow path manufacturing method of heavy rail |
| CN110814023A (en) * | 2019-11-13 | 2020-02-21 | 天津市中重科技工程有限公司 | Rolling process of large and super-large section steel in double-reversible finish rolling area |
| CN111468534A (en) * | 2020-04-29 | 2020-07-31 | 山东德坊新材料科技有限公司 | High-strength light H-shaped steel and hot rolling forming process thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114888077A (en) * | 2022-04-29 | 2022-08-12 | 中冶华天工程技术有限公司 | Composite production process for efficiently producing heavy H-shaped steel and steel sheet pile |
| CN115351070A (en) * | 2022-07-29 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Novel rolling method of H-shaped steel |
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