CN102921722A - H-shaped steel rolling equipment and method - Google Patents

Abstract

The invention provides an H-shaped steel rolling equipment and method. The equipment includes a blanking mill and a finishing mill. There are multiple rolling passes, characterized in that the multiple rolling passes include: the first horizontal rolling pass, the second horizontal rolling pass and the third horizontal rolling pass; the first The lengths between the outer sides of the horizontal rolling pass, the second horizontal rolling pass and the third horizontal rolling pass increase sequentially. The invention provides a billet rolling mill including multiple horizontal rolling passes, which can reduce the number of billet rolling passes, and secondly, can also reduce the rolling passes of the finishing rolling unit, thereby, the present invention can greatly reduce the number of rolling passes Second, reduce costs.

Description

H-beam rolling equipment and method

technical field

The invention relates to a section steel rolling equipment, in particular to an H-section steel rolling equipment and method, and belongs to the technical field of metal plastic processing and forming.

Background technique

As a kind of economical section steel, H-beam has the advantages of large section modulus, strong bending resistance, light unit weight, beautiful appearance, convenient structure, saving man-hours, reducing engineering cost and being recyclable compared with ordinary I-beam. , has been widely used in structural components such as beams or columns in steel structures of industrial and civil buildings, steel structure load-bearing supports of industrial structures, industrial equipment structures such as petrochemical and electric power, long-span steel bridge components, machinery, vehicles, ships, etc. In engineering structures such as frame structures, underground railways and viaduct components. In recent years, as the demand for H-beams increases, the output of H-beams is also increasing, and the theoretical research on H-beam rolling is also deepening.

Be that the Chinese patent application of CN1175914A announces a kind of method for rolling profiled steel and the equipment of producing profiled steel as notification number, it can improve the unit consumption of roll, dimensional accuracy and the stability of rolling, and high productivity is arranged. The material to be rolled in dog-bone shape rough rolled by one or more billet rolling mills (BD) or the like is passed through the use of an intermediate universal rolling mill (UR) for X-shaped rolling, a quick-change vertical roll The rolling mill (QE) and a universal finishing mill (UF) for H-rolling thereby forming flanges on both sides are reversibly rolled.

With the development of continuous casting technology, the current production of H-beams is basically rolled by special-shaped billets. Common H-beam continuous casting billets are generally divided into three specifications: BB1, BB2, and BB3. The structures of the three specifications of continuous casting billets are basically similar to those shown in Fig. 1, but the parameters are different, for example, the lengths L1, L2 and widths L3, L4 are different. Among them, BB1 continuous casting slab has the smallest specification, BB2 continuous casting slab has the second largest specification, and BB3 continuous casting slab has the largest specification. For example, for BB2 continuous casting slab, the lengths L1 and L2 are about 750mm and 510mm respectively, and the widths L3 and L4 are about 90mm respectively. , 370mm; for the BB3 continuous casting slab, the lengths L1 and L2 are about 1024mm and 740mm respectively, and the widths L3 and L4 are about 90mm and 390mm respectively. In addition, the R1/R2/L8/L9 of the BB2 continuous casting slab are 20/70/70/140 (in mm), and the R1/R2/L8/L9 of the BB3 continuous casting slab are 20/70/88.1/ 150 (in mm).

At present, BB3 continuous casting slabs are generally used for rolling H-beams with specifications of HN800mm×300mm. Since the continuous casting slabs of this specification are the largest, when rolling H-beams with specifications of HN800mm×300mm, rough rolling is carried out by BD rolling mill. The pass shape of BD rolling mill is as follows: As shown in Figure 2, it includes a horizontal rolling pass 10 and a box-shaped pass 20 (or vertical rolling pass 20). In addition, when rolling H-beam HN800mm×300mm, the number of rolling passes is 20, including 11 passes in BD rolling mill and 9 passes in TM rolling mill. The defect of high rolling cost.

Contents of the invention

The object of the present invention is to provide a low-cost H-shaped steel rolling equipment and method to solve the problem of high rolling cost of the existing H-shaped steel.

In order to solve the above problems, the present invention provides an H-beam rolling equipment, which includes a billet rolling mill (abbreviated as BD) and a finishing mill. Rolling mill (abbreviated as UR), vertical roll mill (abbreviated as E), and universal finishing mill (abbreviated as UF), the blanking mill has various rolling pass types, and the feature is that the various rolling pass types include: A horizontal rolling pass, a second horizontal rolling pass and a third horizontal rolling pass; the holes of the first horizontal rolling pass, the second horizontal rolling pass and the third horizontal rolling pass The length between the outer sides of the shape increases in turn.

According to a preferred embodiment of the above-mentioned H-shaped steel rolling equipment, wherein, the first horizontal rolling pass and the second horizontal rolling pass are arranged crosswise.

According to a preferred embodiment of the above-mentioned H-shaped steel rolling equipment, wherein, the length between the outer sides of the first horizontal rolling pass is 830 mm, and the outer side of the second horizontal rolling pass The length between them is 916mm, and the length between the outer sides of the third horizontal rolling pass is 934mm.

According to a preferred implementation of the above-mentioned H-shaped steel rolling equipment, the specification of the H-shaped steel is HN800mm×300mm.

In order to solve the above problems, the present invention provides a method for rolling H-shaped steel, which uses any of the above-mentioned rolling equipment to roll H-shaped steel, and includes the following steps: using the billet rolling mill to open the continuous casting billet Billet rolling, specifically, the continuous casting billet enters the first horizontal rolling pass of the billet rolling mill for rolling once, and then back-rolls into the second horizontal rolling pass for rolling once , and then enter the third horizontal rolling pass, reciprocating rolling for 7 passes; then use the finishing rolling mill to roll the continuous casting slab rolled by the billet rolling mill for 5 passes.

According to a preferred implementation of the above-mentioned H-shaped steel rolling method, in the second pass of rolling by the finishing rolling train, the application of the vertical roll mill is omitted.

According to a preferred implementation of the above H-shaped steel rolling method, wherein the continuous casting slab is a BB2 specification H-shaped steel continuous casting slab.

The invention provides a billet rolling mill including various horizontal rolling passes, which can reduce the number of billet rolling passes, and secondly, can also reduce the rolling passes of the finishing rolling group, thereby, the present invention can greatly reduce the number of rolling passes Second, reduce costs.

Description of drawings

Fig. 1 is a structural schematic diagram of a BB2/BB3 specification continuous casting slab;

Figure 2 is a schematic diagram of the pass structure of the existing blanking mill (the unit of dimension in the figure is mm);

Fig. 3 is a schematic view of the pass structure of the billet rolling mill provided by the embodiment of the present invention (the unit of dimension in the figure is mm);

Fig. 4 is a schematic diagram of the rolling schedule of the billet rolling mill according to the embodiment of the present invention;

Fig. 5 is a schematic diagram of the rolling schedule of the finishing rolling train in the embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

The invention provides a low-cost H-shaped steel rolling equipment. Like the prior art, the equipment includes a blanking mill and a finishing mill. The billet rolling mill has a variety of rolling passes. As shown in FIG. 3 , the multiple rolling passes of the blooming mill in the embodiment of the present invention include a first horizontal rolling pass 30 , a second horizontal rolling pass 40 and a third horizontal rolling pass 50 .

The lengths between the outer sides of the first horizontal rolling pass 30 , the second horizontal rolling pass 40 and the third horizontal rolling pass 50 increase sequentially, that is, the lengths L5 , L6 , and L7 increase sequentially. In addition, the rolling center lines of the pass types 30, 40, and 50 are exactly the same.

In this embodiment, the first horizontal rolling pass 30 and the second horizontal rolling pass 40 are arranged crosswise, and the left rolling groove of the first horizontal rolling pass 30 is located at the left and right sides of the second horizontal rolling pass 40 between slots.

The advantage of the cross design pass is that it can improve the utilization rate of the roll, and arrange multiple passes on the limited length roll, which solves the technical problem that multiple passes cannot be arranged on the same roll due to the limitation of the length of the roll body. However, when the length of the roll body is sufficient, the rolling grooves of the pass type may not be intersected.

In addition, the length L5 between the outer sides of the first horizontal rolling pass 30 of the present embodiment (the outer sides of the left and right rolling grooves) is 830 mm, and the length L6 between the outer sides of the second horizontal rolling pass 40 is 830 mm. The length L7 between the outer sides of the third horizontal rolling pass 50 is 916mm, the width (or depth) of the pass 30 is 280mm, the width of the pass 40 and the pass 50 is 270mm. The width of 280mm/270mm refers to the size of the rolling groove in the up and down direction. It is indicated in the figure that the roll gap value needs to be subtracted. In this example, the roll gap value is 20mm. The passes of the above specifications are preferably suitable for rolling H-shaped steel of HN800mm×300mm specification.

As shown in Figure 3, other marked dimensions in the roll can be determined according to the length of the roll itself, such as the midpoint of the length L7 of the third horizontal rolling pass 50 to the middle of the left rolling groove of the first horizontal rolling pass 30 The distance of the point is 1066mm, and the distance from the middle point of the left rolling groove of the first horizontal rolling pass 30 to the inner edge point of the right rolling groove of the first horizontal rolling pass 40 is 358mm.

When implementing the present invention to roll HN800mm×300mm specification H-shaped steel, in order to save cost, the continuous casting slab is BB2 specification.

The continuous casting slab is rolled by using the slab rolling mill with the pass type shown in Figure 3. Specifically, after the continuous casting slab leaves the heating furnace, it undergoes high-pressure dephosphorization. As shown in Figure 4, the continuous casting slab first enters the open The first horizontal rolling pass 30 of the billet rolling mill is rolled once, and then back-rolling enters the second horizontal rolling pass 40, rolling one pass, and then enters the third horizontal rolling pass 50, and reciprocating rolling 7 passes Second-rate. Next, as shown in FIG. 5 , the continuous casting slab rolled by the billet rolling mill was rolled for 5 passes by the finishing rolling mill. Wherein, during the second pass of rolling by the finishing rolling mill, the application of the vertical roll mill (E) is omitted. Among them, the arrangement of the finishing rolling mills is UR-E-UF, and the finishing rolling mills are generally reversible rolling mills. After rolling from UR, they come out from UF, and reverse rolling is just the opposite, rolling in from UF and coming out from UR.

When the production specification of this embodiment is HN800mm × 300mm H-shaped steel, the pass shown in Fig. 3 and the regulations shown in Fig. 3 and Fig. 4 are adopted, and the whole rolling process is reduced to 14 rolling passes compared with the original production process. Moreover, since the specification of BB2 continuous casting slab is smaller than that of BB3 continuous casting slab, and the final rolling is HN800mm×300mm, it means that the BB2 continuous casting slab has a relatively large compression ratio, which is beneficial to improving the structure and properties of the rolled piece.

Utilizing the pass of the present invention, the inventor successfully rolled HN800mm×300mm H-shaped steel by using BB2 continuous casting slab according to the rolling schedule shown in Table 1 below.

In Table 1 below, the meanings of each English or abbreviation are as follows. RUN: pass, GROOVE: hole type (1/C means that the first pass adopts the first horizontal rolling pass 30, 2/B represents the second pass adopts the second horizontal rolling pass 40, 3/A Represents the use of the third horizontal rolling pass 50 reciprocating rolling 7 passes), H-Roll gap: roll spacing; Groove depth total: total pass depth; Rolling speed: rolling speed; Leaving speed: throwing speed; k_in : biting coefficient; k_entry: normal rolling coefficient; k_exit: ejection coefficient; Sta.: stand (refers to the stand of the finishing rolling unit, where UR refers to the intermediate universal rolling mill, E refers to the vertical roll mill, UF refers to the universal Finishing mill); 'a'Thick: web thickness; Flange Thick: flange thickness; Work Dia.: work roll diameter; Speed: speed; Roll time: rolling time; Dead Time: empty roll time, the upper part of Table 1 The half part is the BD rolling procedure, and the lower part is the TM rolling procedure.

Table 1, the rolling schedule of rolling HN800mm×300mm H-beam by using BB2 continuous casting slab

In summary, the present invention can obtain the following advantages:

1. BB2 continuous casting slabs can be used to roll HN800mm×300mm H-beams to expand the source of rolling materials.

2. Reduced the rolling passes of HN800mm×300mm specification H-beam from 20 passes to 14 passes, greatly reducing the rolling cost.

3. Using BB2 continuous casting slab to roll HN800mm×300mm specification H-shaped steel, the compression of the rolled piece is relatively large, which is beneficial to improve the structure and performance of the rolled piece.

It can be known from common technical knowledge that the present invention can be realized through other embodiments without departing from its spirit or essential features. Accordingly, the above-disclosed embodiments are, in all respects, illustrative and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are embraced by the present invention.

Claims (7)

1. A kind of H-beam rolling equipment, comprise billet rolling mill and finish rolling train group, described finish mill train group comprises the middle universal rolling mill, vertical roller mill, universal finishing mill that arrange successively, described billet rolling mill has multiple rolling mills pass, characterized in that the various rolling passes include: a first horizontal rolling pass, a second horizontal rolling pass and a third horizontal rolling pass; The lengths between the outer sides of the first horizontal rolling pass, the second horizontal rolling pass and the third horizontal rolling pass increase sequentially. 2. H-shaped steel rolling equipment according to claim 1, characterized in that, The first horizontal rolling pass and the second horizontal rolling pass are arranged crosswise. 3. H-shaped steel rolling equipment according to claim 1, characterized in that, The length between the outer sides of the first horizontal rolling pass is 830mm, the length between the outer sides of the second horizontal rolling pass is 916mm, and the length between the outer sides of the third horizontal rolling pass The length between the outer sides of the pass pattern is 934mm. 4. H-beam rolling equipment according to claim 1, characterized in that, The specification of the H-shaped steel is HN800mm×300mm. 5. A method for rolling H-shaped steel, characterized in that, utilizing the arbitrary described rolling equipment of claim 1-4 to roll H-shaped steel, and comprising the following steps: The continuous casting slab is rolled by using the billet rolling mill, specifically, the continuous casting billet enters the first horizontal rolling pass of the billet rolling mill for rolling once, and then back-rolls into the The second horizontal rolling pass is rolled once, and then enters the third horizontal rolling pass, and is rolled back and forth for 7 passes; Then, the continuous casting slab rolled by the billet rolling mill is rolled by the finishing rolling mill for 5 passes. 6. H-beam rolling method according to claim 5, is characterized in that, In the second pass of rolling by the finishing rolling train, the application of the vertical roll mill is omitted. 7. H-beam rolling method according to claim 5, is characterized in that, The continuous casting slab is a BB2 specification H-beam continuous casting slab.

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