CN111672938A

CN111672938A - Profile steel web bending correction process

Info

Publication number: CN111672938A
Application number: CN202010488658.7A
Authority: CN
Inventors: 尹正华; 朱旭光; 张卫斌; 金国法; 马龙; 范光明; 圣立芜; 耿鹏; 骆军
Original assignee: Maanshan Iron and Steel Co Ltd
Current assignee: Maanshan Iron and Steel Co Ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-09-18
Anticipated expiration: 2040-06-02
Also published as: CN111672938B

Abstract

The invention discloses a profile steel web plate bending correction process, which utilizes the existing profile steel roller type straightener to correct, the bending radian of a rolled piece web plate is upward, each lower straightening roller of the roller type straightener is used as a support, and the width of each lower straightening roller is normally matched with the width of each roller according to the original width, so that the rolled piece can be normally straightened after two legs are straightened, and a hole pattern for straightening the web plate with the upper straightening roller is formed; for example, currently, a ten-roller straightener is used, the upper and the upper five straightening rollers can be normally configured with straightening rollers, so that a rolled piece can be conveniently bitten and taken off, meanwhile, the straightening effect of the upper legs and the web of the rolled piece is ensured, and other upper rollers such as the upper two, the upper three and the upper four straightening rollers gradually narrow the width of the straightening rollers according to the specific specification of the rolled piece and are matched with the lower roller so as to achieve the aim of straightening the bending of the web. The straightening device and the straightening method have the advantages that the straightening and roll matching are carried out on the existing ten-roll section steel straightening machine, the rolled piece with the bent web plate is compensated and straightened, and the straightening stability and the straightening efficiency of the web plate of the common section steel such as H-shaped steel, parallel leg channel steel and the like are improved.

Description

Profile steel web bending correction process

Technical Field

The invention belongs to the technical field of steel rolling, and particularly relates to a section steel web plate bending correction process which is suitable for correcting the bending of a hot-rolled H-shaped steel and a parallel leg channel steel web plate.

Background

In recent years, with the rapid development of economic construction in China, in order to meet the urgent needs of environmental protection, resource saving and energy, the country gradually advocates the use of steel structures instead of reinforced concrete structures, and the steel structure market in China is briskly developed. The hot-rolled H-shaped steel, the common steel and the parallel leg channel steel are taken as the economic section steel, have the advantages of good unique mechanical property, large bearing capacity, convenience in machining and installation, labor-saving property, attractive appearance, recyclability, and the like, occupy a leading position in steel for a plurality of steel structures, the domestic H-shaped steel demand is increasing day by day, and the market prospect is very wide.

The hot-rolled H-shaped steel is generally rolled by using a universal rolling mill set, the hole pattern of the universal rolling mill set is formed by enclosing an upper horizontal roll, a lower horizontal roll, a left vertical roll and a right vertical roll, the vertical rolls mainly play a role of rolling a flange in a rack, and in the rolling process, the bending phenomenon of an H-shaped steel web is easily caused due to the reason of the arrangement of the universal rolling mill set, for example, a certain H-shaped steel rolling production line of a horse steel consists of 15 nameless mills, wherein 5 roughing mill sets and 10 medium finishing mill sets are adopted, when the H-shaped steel is rolled by using the rolling line, the bending of the H-shaped steel web is caused due to the fact that 15 upper guard plates of the H-shaped steel are low, and the web of the.

The hot-rolled common section steel is rolled by using a universal rolling mill unit, for example, a PFC150 multiplied by 90 multiplied by 24 parallel leg channel steel is rolled by a small H-shaped steel production line of the horse steel, and the specification marks of the channel steel adopt: the PFC is the abbreviation for Parallel leg Channel for height h x width b x theoretical weight, where PFC is the abbreviation for Parallel leg Channel. FIG. 1 is a schematic diagram of two cases of the straightening control part tolerance of parallel leg channel steel, wherein the leg parallelism is k + k1, the range is controlled between-1.0 and +2.0, the web plate straightness is f, and the range is +/-1.0.

The rolled parallel leg channel steel has the problems that the technical condition requirements of S355J0W weather-resistant hot-rolled parallel leg channel steel are that the most difficult technical condition for straightening control is as follows: leg parallelism K + K1 and web flatness f. However, the production line rolling mill equipment is a continuous rolling mill group (15 stands in total), and the raw material is rolled by an H-shaped steel billet type (BB4 special-shaped billet) and is also rolled by a universal roll. Due to the fact that channel steel is rolled through the universal method, in order to effectively eliminate bosses on two sides of a rolled piece during rolling, a boss with the height of 0.5mm (shown in figure 2) is arranged in the middle of a web plate of a finished product front hole rolled piece, metal on the web plate portion of the rolled piece is increased, and metal on legs of the rolled piece is reduced. According to the process conditions and the cooling condition, the rolled piece has slight bosses on two sides and a convex surface in the middle of the web, and because the leg part of the rolled piece is thick and the web is relatively thin, the web bends in the cooling process, thereby bringing difficulty to the control of the flatness f of the normal straightening web of the straightening machine.

The traditional mode adopts the mode of local straightening of pressure to the bending of rolled piece web, as shown in fig. 3, places the rolled piece on rotatory hammering block iron, and through setting up the pneumatic cylinder, the pneumatic cylinder front end sets up main pressure head, is provided with correction part on the main pressure head, utilizes this correction part to straighten the crooked position of rolled piece web, and this kind of mode straightening is inefficient, and main pressure head position control is difficult, simultaneously, utilizes this mode also can't satisfy the demand that the rolled piece straightened in batches.

Disclosure of Invention

Aiming at the technical problem that the bending and the straightening of the web of section steel (such as parallel leg channel steel and H-shaped steel) rolled by a universal rolling mill unit are difficult in the background technology, the invention provides a section steel web bending and straightening process, which is characterized in that a rolled piece with a bent web is straightened and matched by a conventional ten-roller straightener, so that the straightening and straightening stability and the straightening efficiency of the web of common section steel such as H-shaped steel, parallel leg channel steel and the like are improved.

The technical scheme for solving the technical problem of the invention is as follows:

the invention relates to a profile steel web plate bending correction process, wherein the profile steel is rolled by a universal mill train, a rolled piece after rolling is corrected by a ten-roller straightener, and the five-roller straightener comprises an upper straightening roller, a second straightening roller, a third straightening roller, a fourth straightening roller, a fifth straightening roller and a lower straightening roller, wherein the upper straightening roller, the second straightening roller, the third straightening roller, the fourth straightening roller and the fifth straightening roller are vertically corresponding; each upper straightening roller can be subjected to downward stroke adjustment, and each upper straightening roller and each lower straightening roller are formed by assembling a plurality of roller sheets and gaskets and can be subjected to axial stroke adjustment; the method is characterized in that a ten-roller straightener is firstly subjected to straightening and roll distribution according to the specification of a rolled piece to be straightened, and then the ten-roller straightener after the straightening and roll distribution is adjusted is used for carrying out web bending correction on the rolled piece; when each straightening roller is matched, the distance between the left and right outermost sides of a roller sheet is set as the width X of the straightening roller, the inner width value of a rolled piece to be corrected is set as W, when straightening is carried out, the next straightening rollers, the second straightening rollers, the third straightening rollers, the fourth straightening rollers and the fifth straightening rollers are used as supports, the round corners of the roller sheets of the next straightening rollers, the second straightening rollers, the third straightening rollers, the fourth straightening rollers and the fifth straightening rollers are ensured to be consistent with the round corners of the lower horizontal roller of a finishing mill group in a universal mill group, and the widths X of the straightening rollers of the next straightening rollers, the second straightening rollers, the third straightening rollers, the fourth straightening rollers and the fifth straightening rollers and the inner width value W of the rolled piece to; secondly, keeping the fillet of the roller sheet of the upper straightening roller and the fillet of the upper horizontal roller of the finishing mill group in the universal mill group consistent, and keeping the gap amount of 1-3 mm between the width X of the straightening roller of the upper straightening roller and the width W of the straightening roller of the five straightening rollers and the inner width value W of the rolled piece to be straightened; thirdly, adjusting the widths X of the straightening rollers of the upper two, three and four straightening rollers to ensure that the widths X of the straightening rollers of the upper two, three and four straightening rollers are gradually narrowed relative to the width X of the straightening roller of the upper straightening roller; and thirdly, controlling the rolling reduction of the previous straightening rollers to be within the range of 0-2 mm.

According to the technical scheme of the invention, the inner width value W of the rolled piece to be corrected is calculated according to the formula W-UF-rolled piece cold shrinkage rate, wherein UF is the horizontal roll width of the universal finishing mill.

As a further improvement of the technical scheme of the invention, the width X of the straightening roll of the upper two rolls is 5-10 mm smaller than the width X of the straightening roll of the upper straightening roll, the width X of the straightening roll of the upper three rolls is 20-30 mm smaller than the width X of the straightening roll of the upper two straightening rolls, and the width X of the straightening roll of the upper four rolls is 40-50 mm smaller than the width X of the straightening roll of the upper three straightening rolls.

As a further improvement of the technical scheme of the invention, the rolling reduction of the first straightening roller, the second straightening roller, the third straightening roller, the fourth straightening roller and the fifth straightening roller (11, 12, 13, 14 and 15) is respectively 0.5mm, 1.5mm, 1.0mm, 2.0mm and 0 mm.

As a further improvement of the technical scheme of the invention, the section steel is H-shaped steel or parallel leg channel steel.

When the straightening machine is applied, an inlet guide and an outlet guide are respectively arranged at the front and the rear of a ten-roller straightening machine, a rolled piece sent from a universal rolling mill unit is sent into an upper straightening roller and a lower straightening roller of the straightening machine through the inlet guide, and then is corrected by other straightening rollers and then is sent into the outlet guide, so that the correction and repair of the rolled piece are completed, the fillet of the upper straightening roller and the fillet of the upper horizontal roller of a finishing mill unit of the universal rolling mill are kept consistent, the width of the straightening roller and the inner width of the rolled piece are kept at a clearance amount of 1-3 mm, the rolled piece can be conveniently bitten and taken off, the straightening effect of the upper leg and the web of the rolled piece is ensured, and the width X of the straightening rollers is gradually narrowed by other straightening rollers according to the bending condition of the web of the rolled piece and is matched with the next straightening rollers, the second straightening roller, the third straightening roller.

Compared with the prior art, the section steel web bending correction process has the advantages that the existing ten-roller straightener for correcting the section steel is used for correcting the section steel, the upper and lower straightening rollers of the ten-roller straightener can be matched according to the specification of the section steel to be straightened, the bent part of the web of the section steel to be straightened can be effectively straightened, the straightening efficiency is high, the straightening effect is good, and meanwhile, the ten-roller straightener with the re-matched rollers can be used for straightening rolled pieces in batches, so that the production requirement is met.

Drawings

The invention is further described with reference to the following figures and detailed description:

FIG. 1: schematic diagrams of two conditions of the tolerance of a parallel leg channel steel straightening control part;

FIG. 2: schematic diagram of a front hole of a finished product during rolling of the section steel;

FIG. 3: a process schematic diagram of conventional pressure correction;

FIG. 4: the invention discloses a process diagram for correcting the bending of a section steel web;

FIG. 5: the structure schematic diagram of the roller sheet of the straightening roller is shown;

in the figure: 11. the device comprises an upper straightening roll, 12, an upper two straightening rolls, 13, an upper three straightening rolls, 14, an upper four straightening rolls, 15, an upper five straightening rolls, 21, a lower straightening roll, 22, a lower two straightening rolls, 23, a lower three straightening rolls, 24, a lower four straightening rolls, 25, a lower five straightening rolls, 3, a rolled piece, 4, an inlet guide, 5, an outlet guide, 6, a roll sheet, 7, a hydraulic cylinder, 8, a main pressure head, 9, a straightening component, 10, a rotary anvil, 61 and a gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs.

Referring to fig. 4 and 5, a web bending correction process for a section steel according to the present invention, where the section steel may be an H-section steel or a parallel leg channel steel, the section steel is rolled by a universal rolling mill train, and a rolled piece is corrected by a conventional five-roll straightener for bending a web, as exemplified by a PDS220 section steel roll straightener manufactured by DANIELI corporation, the straightener includes upper and lower corresponding upper and lower first, second, third, fourth, and

fifth straightening rolls

11, 12, 13, 14, 15 and lower and second, third, fourth, and

fifth straightening rolls

21, 22, 23, 24, 25, the upper and lower corresponding straightening rolls form four deformation zones, each upper straightening roll can perform a pressing stroke adjustment, each upper or lower straightening roll is assembled by a plurality of roll sheets and spacers, and may be an H-section steel or a parallel leg channel steel, and the upper or lower straightening roll is configured by a universal rolling mill train2 roller sheets and gaskets, or 3 roller sheets and gaskets, or 1 roller sheet and gasket, as shown in fig. 5, taking two roller sheets 6 as an example, each straightening roller comprises a left roller sheet 6 and a right roller sheet 6, a gasket 61 is arranged between the two roller sheets 6, the two roller sheets 6 can be adjusted in axial stroke, and the specific parameters are that the roller spacing is 900mm, the adjustment stroke is 0-400 mm, the axial adjustment stroke is-15 mm, the maximum interface modulus is 3.5-220 cm³The method is characterized in that firstly, a ten-roll straightening machine is subjected to straightening roll distribution according to the specification of a rolled piece to be straightened, then, the rolled piece is subjected to web bending correction through the ten-roll straightening machine after the straightening roll distribution is adjusted, a PFC150 × 90 × 24 parallel leg channel steel is taken as an example for explanation, the distance between the left and right outermost sides of two roll sheets 6 of each straightening roll is set as a straightening roll width X, the inner width value of the rolled piece to be straightened is W, the inner width value W of the rolled piece to be straightened cannot be measured due to just rolling of the rolled piece is generally calculated, namely, the cold shrinkage rate (UF is the width of a universal finishing roll) of the UF-UF is obtained through the formula W, when the rolled pieces are distributed, firstly, the next two, three, four, five

straightening rolls

21, 22, 23, 24 and 25 are used as supports, the next two, three, four, five straightening

rolls

21, 22, 23, 24 and 25 are simultaneously ensured to be consistent with the widths of the

next straightening rolls

21, 22, 23, 24 and the widths of the straightening rolls in a straightening roll group of the straightening rolls, the straightening roll distribution is sometimes caused by the fact that the width of the same size of the straightening roll, the straightening roll width of the straightening roll, the width of the straightening roll X, the straightening roll width of the straightening roll X is determined by the same as the width of the straightening roll X, the straightening roll width of the straightening roll X, the width of the straightening roll straightening machine group of the width of the straightening roll straightening machine group of the straightening machine, the straightening machine group of the same as the width of the same as the width ofThe width X of the straightening roll of the roll 11 is gradually narrowed, and the upper two, three and four straightening

rolls

12, 13 and 14 have no requirement of round corners; and controlling the rolling reduction of the previous one, two, three, four and five straightening

rolls

11, 12, 13, 14 and 15 within the range of 0-2 mm.

In this embodiment, in order to further improve the straightening effect of the rolled piece, the width X of the straightening roll of the upper two roll 12 is 5mm to 10mm smaller than the width X of the straightening roll of the upper one straightening roll 11, the width X of the straightening roll of the upper three roll 13 is 20mm to 30mm smaller than the width X of the straightening roll of the upper two straightening roll 12, and the width X of the straightening roll of the upper four roll 14 is 40mm to 50mm smaller than the width X of the straightening roll of the upper three straightening roll 13, more specifically, the widths X of the straightening rolls of the upper two, three, and four straightening

rolls

12, 13, and 14 are respectively set to 120mm, 100mm, and 50mm, and the rolling reductions of the upper one, two, three, four, and five straightening

rolls

11, 12, 13, 14, and 15 are respectively adjusted to 0.5mm, 1.5mm, 1.0mm, 2.0mm, and 0 mm.

When the straightening machine is applied, an inlet guide 4 and an outlet guide 5 are respectively arranged at the front and the rear of a ten-roller straightening machine, a rolled piece 3 sent from a universal rolling mill unit is sent into an upper straightening roller 11 and a lower straightening roller 21 of the ten-roller straightening machine through the inlet guide 4, and then is corrected by other straightening rollers and then is sent into the outlet guide 5, so that the correction and repair of the rolled piece 3 are completed, the upper straightening roller 11 and the lower straightening roller 21 are consistent with the round corners of the horizontal rollers on a finishing mill unit of the universal rolling mill, the width of the straightening roller and the internal width of the rolled piece keep a gap amount of 1-3 mm, the normal engagement and disengagement of the rolled piece are facilitated, the straightening effect of upper legs and a web of the rolled piece is ensured, and the widths X of the straightening rollers are gradually narrowed according to the bending condition of the web of the rolled piece and are matched with the next straightening rollers, the second straightening roller, the third straightening roller, the fourth straightening roller and the fifth straightening. The bending of the web plate can be corrected by adjusting the roll matching conditions of the upper straightening roll and the lower straightening roll according to the specifications of the section steel with other specifications, and the efficiency is high and the effect is good.

Claims

1. A section steel web plate bending correction process is characterized in that a section steel is rolled by a universal rolling mill unit, rolled pieces after rolling are corrected by a ten-roller straightener, and the ten-roller straightener comprises an upper straightening roller (11, 12, 13, 14 and 15), a lower straightening roller (21, 22, 23, 24 and 25), a third straightening roller, a fourth straightening roller and a fifth straightening roller which correspond to each other up and down; each upper straightening roller can be subjected to screw-down stroke adjustment, each upper straightening roller and each lower straightening roller are formed by assembling a plurality of roller sheets (6) and gaskets (7), and axial stroke adjustment can be carried out; when each straightening roller is matched, the distance between the left and right outermost sides of a roller sheet (6) is set as the width X of the straightening roller, the inner width value of a rolled piece to be straightened is set as W, when straightening is carried out, firstly, the next, second, third, fourth and fifth straightening rollers (21, 22, 23, 24 and 25) are used as supports, meanwhile, the round corners of the roller sheets of the next, second, third, fourth and fifth straightening rollers (21, 22, 23, 24 and 25) are ensured to be consistent with the round corners of the lower horizontal roller of a finishing mill group in a universal mill group, and the width X of the straightening rollers of the next, second, third, fourth and fifth straightening rollers (21, 22, 23, 24 and 25) and the inner width value W of the rolled piece to be straightened are kept at the gap amount of 1-3 mm; secondly, keeping the fillet of the roller sheet of the upper straightening roller (11) and the fillet of the upper horizontal roller of the finishing mill group in the universal mill group consistent, and keeping the gap amount of 1-3 mm between the width X of the straightening roller of the upper straightening roller (11) and the width X of the straightening roller of the fifth straightening roller (15) and the inner width W of the rolled piece to be straightened; thirdly, adjusting the width X of the straightening rolls of the upper two, three and four straightening rolls (12, 13, 14) to ensure that the width X of the straightening rolls of the upper two, three and four straightening rolls (12, 13, 14) is gradually narrowed relative to the width X of the straightening roll of the upper straightening roll (11); then, the rolling reduction of the previous one, two, three, four and five straightening rolls (11, 12, 13, 14, 15) is controlled within the range of 0mm to 2 mm.

2. A profile steel web bow correction process as set forth in claim 1 wherein said rolled stock to be corrected has an internal width W calculated from the cold shrinkage of the rolled stock in the formula W-UF-UF, where UF is the universal finishing mill horizontal roll width.

3. The profile steel web plate bending correction process as claimed in claim 1, wherein the width X of the straightening roll of the upper two rolls (12) is 5 mm-10 mm smaller than the width X of the straightening roll of the upper straightening roll (11), the width X of the straightening roll of the upper three rolls (13) is 20 mm-30 mm smaller than the width X of the straightening roll of the upper two straightening rolls (12), and the width X of the straightening roll of the upper four rolls (14) is 40 mm-50 mm smaller than the width X of the straightening roll of the upper three straightening rolls (13).

4. A profile steel web bending correction process according to claim 1 or 2, wherein the rolling reduction of the first, second, third, fourth and fifth straightening rollers (11, 12, 13, 14, 15) is 0.5mm, 1.5mm, 1.0mm, 2.0mm and 0mm respectively.

5. A profile steel web bending correction process according to claim 1, wherein the profile steel is H-shaped steel or parallel leg channel steel.