JP3302532B2 - Rough rolling mill and rolling method for hot strip rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement and a structure of a rough rolling mill of a rolling equipment for producing a hot strip by rolling a slab, and more particularly to a hot strip rolling equipment suitable for small and medium-sized rolling equipment. The present invention relates to a rough rolling mill and a rolling method thereof.

[0002]

2. Description of the Related Art The arrangement of a rough rolling mill in a conventional hot strip rolling plant is a full continuous type (Full Continuous Typ.).
e), a semi-continuous type, and a combination of the above two (Three Quaters Type).
Initially, the semi-continuous type was the mainstream, but with the demand for increased productivity and increased coil weight, the type was temporarily changed to a large continuous type. In addition, the combination type (Three-way type) was required to reduce equipment costs and save energy. Quaters Type).

A rough rolling mill in a hot strip rolling facility includes a horizontal mill for rolling in the thickness direction and an edger mill for rolling down in the width direction. A slab heated in a heating furnace is heated to a predetermined width by the edger mill and the horizontal mill. And then transported to a finishing mill.

[0004] In recent years, demands for higher efficiency of continuous cast slabs, and demands for forming a sheet width in schedule-free hot rolling have increased the slab width, and vertical rolling mills ( Although facilities for installing a VRM) and a sizing press have appeared, such facilities are generally large-scale, and the facility length of the rough rolling mill is 175 to 270 m.
In order to save energy, the thickness of the bar (rolled material coming out of the rough rolling mill) to be put into the finishing mill is increased,
Predetermined products are manufactured by up to seven finishing mills. Further, as a method for shortening the equipment length to some extent, there is a facility in which a coil box is arranged between a rough rolling mill and a finishing rolling mill.

[0005] As a medium-to-small-scale equipment for the large-scale equipment as described above, there is a sketter equipment for rolling mainly using special steel (SUS or the like). In this sketter equipment, one rough rolling mill and one finish rolling mill are provided. The length of the equipment is shortened with the machine. In addition, a facility has been proposed for reducing the number of rolling mills by performing tandem rolling using a rolling mill called a twin mill in which two pairs of horizontal rolls are incorporated in a pair of housings. Further, recently, a facility for rolling a slab from a thin slab continuous caster capable of casting a thin slab directly through a finishing mill has been developed and operated.

On the other hand, as a rolling mill having an ability to change a sheet width, an edger roll and a horizontal roll, which are arranged in the order of an edger roll, a horizontal roll, and an edger roll, are integrated. JP-A-55-10087, JP-A-55-126307, JP-A-58-1
No. 6,709,709.

[0007]

Recently, there has been an increasing need for small and medium-scale rolling equipment for producing hot strip coils from continuous cast slabs of ordinary steel produced in an electric furnace. There is a demand for economical equipment that can be used as a main raw material, can be operated easily and stably with low equipment costs, and can manufacture high-quality products with high efficiency.

In order to achieve this requirement, it is essential to reduce the equipment cost by shortening the equipment length and reducing the number of rolling mills. Efficient rolling is stabilized by equipment capable of changing the sheet width. It must be done by operation.

In a large-scale facility in which the above-described rough rolling mill and 6 to 7 finishing rolling mills are combined, the rough rolling mill is a reversing roll of 7 passes or more, and the total number of rolling mills increases. Becomes longer. Therefore, it is difficult to shorten the equipment length and improve the rolling efficiency.

[0010] Further, when trying to roll ordinary steel in a skeletal facility having one rough rolling mill and one finishing rolling mill,
There are difficulties in securing production volume and improving surface quality.

[0011] Further, a twin mill in which two pairs of horizontal rolls are incorporated in a pair of housings has difficulties in guiding rolled material, controlling plate thickness, and removing scales. However, there is a difficulty in that a simple roll driving mechanism is required and a large plate width changing ability cannot be obtained.

Further, equipment for rolling slabs from a continuous thin slab caster directly through a finishing mill requires a long tunnel furnace, and the equipment length cannot be reduced so much. In the production of slabs, stable operation cannot be performed because scrap cannot be supplied constantly, and scraps of inferior quality may not be able to withstand production by a thin slab continuous caster.

On the other hand, JP-A-55-10087, JP-A-55-126307, and JP-A-58-1670
No. 9 discloses a rolling mill having a capability of changing the width of a sheet in which a housing is devised. However, a small and medium-sized rolling mill for producing a hot strip coil from a continuous cast slab of ordinary steel produced in an electric furnace is used. It does not meet the needs of the scale rolling equipment, nor does it take into account the scale, function, efficiency, desired product quality, yield and productivity, manufacturing cost, ease of operation and workability of the entire rolling equipment.

[0014] Further, if it is attempted to realize a small-to-medium-scale rolling facility using the conventional technology described in the above-mentioned publications,
Since it is necessary to perform rolling from a thick plate to a somewhat thin plate, particularly when the plate becomes thin, the material being rolled is meandered between the rolls, so that it becomes difficult to guide the material. Therefore, it hinders easy and stable operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rough rolling of a hot strip rolling facility which can realize a small-to-medium-scale rolling facility which can easily and stably operate with low equipment cost and can produce high quality products with high efficiency. A rolling mill and a rolling method.

[0016]

According to the present invention, in order to achieve the above object, two horizontal mills are provided in a rough rolling mill of a rolling equipment for manufacturing a hot strip by rolling a slab.
Two horizontal mills and three edger mills
Sorted arranged to and connecting each mill housing alternately, the feed rollers provided in each of the inlet and outlet of each of each and two horizontal mill Ejjamiru the three above, between the Ejjamiru horizontal mill Are provided with side guides that can be opened and closed to prevent meandering , and a mill group including the three edger mills and two horizontal mills constitutes one unit for reversing rolling. A rough rolling mill for hot strip rolling equipment is provided.

In the rough rolling mill of the above hot strip rolling equipment, preferably, the side guides are opened and closed in the width direction of the material being rolled and guided from both sides thereof;
An open / close support arm that supports the guide portion, and a drive mechanism that drives the guide portion to open and close via the open / close support arm, such that a part of the open / close support arm passes through the housing of the horizontal mill. Constitute.

[0018] Preferably, descaling headers for removing and removing scale generated on the surface of the material being rolled with high-pressure water are further disposed above and below each of the entrance and exit sides of the horizontal mill.

According to the present invention, in order to achieve the above-mentioned object, two horizontal mills are provided in a rough rolling mill of a rolling equipment for manufacturing a hot strip by rolling a slab ,
The two horizontal mills and the two edger mills are alternately arranged so that the housings of the respective mills are connected to each other, and feed is performed to each of the two edger mills and the inlet / outlet side of each of the two horizontal mills. Rollers were provided to prevent meandering between the edger mill and the horizontal mill .
A rough rolling mill for hot strip rolling equipment, characterized in that a side guide for the hot strip mill is provided, wherein a mill group including the two edger mills and the two horizontal mills constitutes one unit for reversing rolling. Provided.

According to the present invention, in order to achieve the above object, two horizontal mills are provided in a rough rolling mill of a rolling facility for rolling a slab to produce a hot strip .
The two horizontal mills and two Ejjami Le, Ejjamiru, horizontal mills, horizontal mills, and arranged so as to connect the forward and and the mill housing Ejjamiru, the Ejjamiru two above each and two A feed roller is provided on each of the entrance and exit sides of the horizontal mill, and side guides for preventing meandering are provided between the edger mill and the horizontal mill and between the two horizontal mills, respectively. And a group of mills having two horizontal mills constitute one unit for reversing rolling, and a rough rolling mill of a hot strip rolling equipment is provided.

Further, according to the present invention, the rough rolling mill of the hot strip rolling equipment as described above is used, and a mill group including the two edger mills and the two horizontal mills is defined as one unit. There is provided a rolling method characterized by performing a reversing rolling including a number of direction changes. In order to achieve the foregoing objects, according to the present invention, the front Ejjamiru, front horizontal mill, intermediate Ejjamiru, rear horizontal mill, together with the rear Ejjamiru each mill housing is disposed so as to connect, et
Each between the mill and horizontal mill to prevent meandering
A side guide is provided, and in the first pass, the front edger mill, the front horizontal mill, the intermediate edger mill, the rear horizontal mill, and the rear edger mill are passed through the rolled material in this order, and the front edger mill and the intermediate edger mill are used. Performing a first unidirectional tandem rolling step in which a width direction reduction and a thickness direction reduction by the front horizontal mill and the rear horizontal mill are performed, and in a second pass, the direction is changed to the rear edge mill, the rear horizontal mill. The intermediate edger mill, the front horizontal mill, and the front edge mill are passed in the order of the material to be rolled, and the sheet width direction reduction by the rear edge mill and the intermediate edger mill and the sheet thickness direction by the rear horizontal mill and the front horizontal mill are performed. A second unidirectional tandem rolling process for rolling is performed, In the pass, the direction is further changed, and the material to be rolled is passed in the order of the front edger mill, the front horizontal mill, the intermediate edger mill, the rear horizontal mill, and the rear edger mill. A rolling method is provided in which a third one-way tandem rolling step is performed in which a width-direction reduction and a reduction in a thickness direction by the front horizontal mill and the rear horizontal mill are performed.

[0022]

In the rough rolling mill of the present invention constructed as described above, three edger mills and two horizontal mills are alternately arranged, and a mill provided with these three edger mills and two horizontal mills By performing the reversing rolling with the group as one unit, it is possible to secure a sufficient rolling capacity including a change in the sheet width, and it is possible not only to produce a high-quality product, but also to perform a Since the housings of the mill are arranged so as to be connected to each other, the occupied length of the rough rolling mill is shortened, which contributes to a reduction in equipment length and equipment costs. Further, since the bar can be fed to the finishing mill with a thinner bar thickness than before, the number of mills including the number of finishing mills can be reduced, which also contributes to shortening the equipment length. Further, by providing three edger mills and two horizontal mills, it is possible to reduce the number of direction changes during reversing rolling, and to reduce idle time associated with the direction change, thereby contributing to higher efficiency. .

The material being rolled was provided on feed rollers provided on each of the three edger mills and on each of the inlet and outlet sides of each of the two horizontal mills, and further on each between the edger mill and the horizontal mill. Openable and closable side guides prevent meandering between rolls,
It is reliably guided between the rolls of each mill, and stable operation is possible.

From the above, it is possible to realize a small-to-medium-scale rolling equipment capable of reducing equipment costs, easily and stably operating, and efficiently producing high-quality products.

In the side guide, a guide portion supported by the open / close support arm is driven to open / close by a drive mechanism via the open / close support arm, thereby opening and closing in the width direction of the hot strip and guiding from both sides. At this time, a part of the opening / closing support arm penetrates the housing of the horizontal mill, so that the guide portion can be supported by the opening / closing support arm.

Further, by disposing a descaling header for ejecting high-pressure water above and below each of the inlet and outlet sides of the horizontal mill, scale generated on the surface of the material being rolled is peeled off by the reduction in the width direction of the sheet by the edger mill. Before entering the horizontal mill, it can be stripped and removed by high-pressure water. Therefore, the scale is prevented from being caught between the rolls of the horizontal mill, and a high-quality product can be manufactured.

Further, in the rolling method of the present invention, the rough rolling mill of the hot strip rolling equipment as described above is used, and a mill group including two edger mills and two horizontal mills is used as one unit to perform two times. A total of three reversing rollings including a change in direction are performed. At this time, the number of passes by the horizontal mill is six in total. In this method, since the direction change is performed twice, the idle time associated with the direction change is reduced, and highly efficient rolling can be performed. Also, at both ends of the rough rolling mill, tables for holding the rolled material at the time of direction change are required, and the length of these tables is such that one of the rolled materials after two passes out of all six passes by the horizontal mill is used. It is enough if the other length is as short as the rolled material length after 4 passes,
This can contribute to shortening the equipment length of the rough rolling mill including the table length.

According to the present invention, in the above-described rough rolling mill, two edger mills and two horizontal mills are alternately arranged, or two edger mills and two horizontal mills are replaced by an edger mill, A horizontal mill, a horizontal mill, and an edger mill may be arranged in this order. In these cases, the former has a structure without an edger mill on either side of the rough rolling mill, and the latter has a structure without an edger mill in the middle of the rough rolling mill. Applicable to

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a rough rolling mill and a rolling method of a hot strip rolling facility according to the present invention will be described with reference to FIGS.

FIG. 1 is a horizontal sectional view of a surface including a rolled material in the rough rolling mill of the present embodiment, and FIG.
FIG. 3 is a cross-sectional view as viewed from the -II direction, and FIG. 3 is a view showing a path flow of the entire hot strip rolling equipment including the rough rolling mill shown in FIGS. 1 and 2.

First, the path flow of the hot strip rolling equipment will be described with reference to FIG. The slab 50 extracted from the heating furnace 1 is subjected to tandem reversing rolling, including turning twice, in a rough rolling mill 2 to form a bar material 5 having a predetermined thickness and width.
And rolled into a coil box 3 to form a coil 4
Becomes The bar material 51 is unwound from the coil 4 and further rolled by the finishing mill group 5 to form a hot strip 52 having a predetermined width and thickness. The hot strip 52 is wound by the down coiler 6 to form the product coil 7.

Next, the configuration of the rough rolling mill 2 of this embodiment will be described with reference to FIGS. The rough rolling mill 2
An H-tandem lever mill, a front edger mill 10 including a pair of edger rolls 11a, an edger housing 12a, and an edger driving device 13a.
a, a pair of horizontal rolls 21a, a horizontal mill housing 22
a, a front horizontal mill 20a composed of a horizontal roll driving device 23a, an intermediate edger mill 10b composed of an edger roll 11b, an edger housing 12b, and an edger driving device 13b as in the front edge mill 10a, and the same as the front horizontal mill 20a. Horizontal roll 21
b, horizontal mill housing 22b, horizontal roll drive 2
3b, the edger roll 11c and the edger housing 12 as in the case of the rear horizontal mill 20b, the front edger mill 10a and the intermediate edger mill 10b.
c, a rear edger mill 10c composed of an edger driving device 13c, and each of the housings 12a-1
Each mill is continuously arranged so that 2c may be connected.

Each mill is provided with one feed roller on each of the inlet and outlet sides. That is, a feed roller 30 is provided on the entrance / exit side of the front edge mill 10a, a feed roller 31 is provided on the entrance / exit side of the front horizontal mill 20a, and a feed roller 32 is provided on the entrance / exit side of the intermediate edger mill 10b.
However, a feed roller 3 is provided at the entrance and exit of the rear horizontal mill 20b.
3, a feed roller 34 is provided on the entrance / exit side of the rear edger mill 10c. The feed rollers 30 to 34 are rotated forward and reverse by a motor,
And transport it without damaging it.

Further, between each edger mill and the horizontal mill, there is provided a side guide which can be opened and closed in the width direction of the rolled material 50a. That is, a side guide 40 is provided between the front edge mill 10a and the front horizontal mill 20a, a side guide 41 is provided between the front horizontal mill 20a and the intermediate edge mill 10b, and a side guide is provided between the intermediate edge mill 10b and the rear horizontal mill 20b. A guide 42 is provided between the rear horizontal mill 20b and the rear edger mill 10c. Side guide 4
Among the 0 to 43, for example, the side guide 40
A side gutter (guide portion) 40A that opens and closes in the width direction of 0a and guides from both sides thereof, an opening and closing support arm 40B that supports the side gutter 40A, and a drive mechanism 40C that opens and closes the side gutter 40A via the opening and closing support arm 40B. . The side gutter 40A can be opened and closed to a width suitable for the width of the rolled material 50a, and accurately guides the rolled material 50a between the rolls. Opening / closing support arm 40B
(The right arm in the figure) is a horizontal mill housing 2
2a, so that the side garter 40
A can be supported by the open / close support arm 40B. The configuration of the side guides 41 to 43 is the same as that of the side guide 40.

Further, roll guides 60 and 61 are provided on the entrance and exit sides of the horizontal roll 21a in the front horizontal mill 20a and on the entrance and exit sides of the horizontal roll 21b in the rear horizontal mill 20b, respectively. Winding is prevented. Roll guide 60, 6
Coolant headers 70 and 71 are disposed on the respective 1, and coolant (including a lubricant in some cases) for cooling the front horizontal mill 20 a and the rear horizontal mill 20 b is ejected from the coolant headers 70 and 71. . In addition to the coolant headers 70 and 71, de-scaling headers 80 and 81 are disposed on the roll guides 60 and 61, respectively. From the de-scaling headers 80 and 81, the incoming and outgoing sides of the horizontal mills 20a and 20b are respectively provided. High-pressure water is blown up and down to peel off and remove scale generated on the surface of the rolled material 50a.

Next, the rough rolling mill 2 constructed as described above
Will be described. FIG. 4 is a diagram (rolling follow) illustrating a rolling state by the rough rolling mill 2 when rolling is performed toward the right side of the drawing (one-way pass to the right). The slab 50 extracted from the heating furnace 1 proceeds in the direction of the arrow (rightward) in the figure, and is reduced in the sheet width direction by the edger roll 11a of the front edger mill 10a.
The horizontal roll 21a of the front horizontal mill 20a reduces the thickness in the thickness direction. Rolling is performed in the same manner by the intermediate edger mill 10b and the rear horizontal mill 20b, but usually, the edger roll 11 of the rear edger mill 10c is used.
In c, the rolling in the sheet width direction is not performed. In this rolling operation, the rolled material 50a is fed to the feed rollers 3 on the entrance and exit of each mill.
It is transported without scratches by 0 to 34 and guided by the side guides 40 to 43 between each edger mill and the horizontal mill, so that meandering between each roll is prevented, and between the rolls of each mill is ensured. Guided, stable operation is possible.

In the above, the descaling header 8
High pressure water is jetted from 0, 81, and the scale generated on the surface of the rolled material 50a is peeled off and removed. As a result, the scale generated on the surface of the rolled material 50a (including the scale peeled off by the reduction in the sheet width direction by the front edge mill 10a or the intermediate edge mill 10b) is removed before entering the front horizontal mill 20a or the rear horizontal mill 20b. Peeling,
The front horizontal mill 20
a and between the rolls of the rear horizontal mill 20b are prevented from being caught by the scale, and a high quality product can be manufactured.

The length of the slab 50 is 10 m or more.
One-way tandem rolling (first pass) is performed by the rough rolling mill 2 until the tail of the rolled material 50a is longer than the length of the rough rolling mill 2, that is, between the front edge mill 10a and the rear edge mill 10c. However, no reduction is performed in the rear edger mill 10c. As soon as the buttocks of the rolled material 50a pass through the back edger mill 10c, the direction is changed, and dandem rolling (reverse rotation pass) is performed in the reverse direction. Perform rolling. However, the reduction by the front edger mill 10a is not performed. Then, when the buttocks of the rolled material 50a pass through the front edger mill 10c, the direction is changed again, tandem rolling is performed in the same procedure as in the first pass, and the bar material 51 after the rough rolling is wound by the coil box 3. However, also at this time, the rolling down by the rear edger mill 10c is not performed.

As described above, in the rough rolling mill 2, a total of six passes (hereinafter referred to as an "edger pass") by an edger mill that reduces in the sheet width direction are performed by a horizontal mill (hereinafter referred to as a horizontal mill pass) that reduces in the sheet thickness direction. Will be performed six times in total. Thus, it can be seen that sufficient rolling capacity can be ensured, comparable to the above-mentioned large-scale equipment. In particular, regarding the edger pass, the amount of width change in one edger mill is restricted by the buckling of the rolled material and the width expansion in the next horizontal mill pass. It can be said that the plate width changing ability can be increased.

As factors determining the equipment length of the rough rolling mill, the length in the pass direction of each of the mills constituting the rough rolling mill and the length of the rolled material at the time of rolling are dominant. Since the coil box 3 that winds the bar material 51 is installed at the rear of the bar 2, the length of the bar material 51 after the completion of the rough rolling is independent of the equipment length of the rough rolling mill 2. It is determined by adding the length in the pass direction of the machine 2, the length of the rolled material 50 a after the first pass bottom pass, and the length of the rolled material 50 a after the reverse pass bottom pass. At both ends of the rough rolling mill 2, the rolled material 50 a after the first pass bottom pass and the rolled material 50 a after the reverse pass bottom pass are removed.
Are required to hold the rolled material 50a after two passes in a six-pass horizontal mill pass, and the other is a rolled material 50a after four passes. It is sufficient if the length is as short as about the length of the table, which can contribute to shortening the equipment length of the rough rolling mill 2 including the length of the table. Moreover, the rough rolling mill 2
In the above, since the housings of the respective mills are arranged so as to be connected to each other, the equipment length is also reduced.

FIG. 5 shows a comparison result between the rough rolling mill according to the present embodiment and the rough rolling mill according to the prior art. FIG. 5 shows a coarse 2H twin lever mill and a coarse 2H single lever mill (corresponding to a conventional large-scale facility) as prior art to this embodiment. Here, as a material to be subjected to rough rolling,
The thickness of the slab was 200 mm, the length of the slab was 11 m, the plate thickness of the bar material after rough rolling was 18 mm, and the number of finishing mills after rough rolling was four. In addition, the arrangement of each equipment is schematically shown separately for a driving part and a roll part, and a path diagram is shown below the arrangement.

As for the equipment length, the equipment length can be reduced by 74 m in this embodiment as compared with the coarse 2H single lever mill. Regarding the equipment cost, in the case of the coarse 2H twin lever mill, the drive cost is too large to reduce the equipment cost, and in the case of the coarse 2H single lever mill, the equipment length is long and the equipment cost is large. While
In the present embodiment, both advantages that the driving device is simple and the equipment length can be reduced can be minimized.

Regarding the rolling capacity, if the rolling capacity in the thickness direction is evaluated by the number of horizontal mill passes (the number of H passes) and the strip width changing ability is evaluated by the number of edger mill passes (the number of E passes), the conventional large-scale equipment It can be seen that small and medium-scale rolling equipment can be realized while securing the same capacity as.

There are many items to evaluate the quality of the product quality, and it should not necessarily be determined only by rough rolling. For example, the number of times of surface scale removal during rough rolling, that is, how many times descaling is performed The evaluation of the surface quality by evaluating the degree (in FIG. 5, indicated as the number of desks) is also a major factor affecting the product quality. In the present embodiment, the number of times of deske is six, and it can be said that this is a high-quality rough rolling mill.

Although the criteria for evaluating the productivity cannot be easily determined, for example, if the evaluation is made based on the ratio of the idle time,
It can be said that the smaller the number of changes in the direction of the rolled material, the greater the productivity. In this embodiment, the direction change of the rolled material is performed twice, which means that the productivity is high.

Comprehensively looking at the above comparison results, the rough rolling mill of this embodiment is small and medium-sized in terms of reduction of equipment cost, simplification and stabilization of operation, improvement of product quality and high efficiency. It will be seen that a scale rolling facility can be realized.

That is, according to the above-described embodiment, 3
Edger mills 10a, 10b, 10c and two horizontal mills 20a, 20b are alternately arranged.
Since a total of three reversing rollings including two direction changes are performed as one unit, a sufficient rolling capacity including a change in the sheet width can be secured, and a high-quality product can be manufactured. Further, the housings 12a, 22a, 12
Since b, 22b, and 12c are arranged so as to be connected, it is possible to reduce the equipment length and the equipment cost. Further, the number of times of the direction change during the reversing rolling can be reduced, and the idle time associated with the direction change can be shortened, and high efficiency can be achieved.

Further, three edger mills 10a, 10
b, 10c and two horizontal mills 20a, 20b
Feed rollers 30 to 34
And side guides 40 to 4 provided between the edger mills 10a, 10b, 10c and the horizontal mills 20a, 20b.
By providing 3, the meandering of the rolled material 50a is prevented, and the rolled material 50a is reliably guided between the rolls of each mill to perform a stable operation.

Therefore, according to the present embodiment, a small-to-medium-scale rolling plant capable of reducing equipment costs, easily and stably operating, and efficiently producing high-quality products is realized. it can.

Further, since the descaling headers 80 and 81 are arranged above and below the entrance and exit sides of the horizontal mills 20a and 20b, scale generated on the surface of the material being rolled can be peeled off and removed. The scale is prevented from being caught between the rolls, and a high-quality product can be manufactured.

In this embodiment, the horizontal mills 20a, 20a
Although a simple and inexpensive 2H mill (two-stage mill) is used as b, the same effect can be obtained with a 4H mill (four-stage mill).

When the ability to change the sheet width is not required to be very large, a structure without the edger mill on one side of the rough rolling mill or a structure without the edger mill in the middle of the rough rolling mill may be adopted.

[0053]

According to the present invention, three edger mills and two horizontal mills are alternately arranged, and this group of mills is used as one unit to perform reversing rolling. High rolling capacity and high quality products can be manufactured. Further, since the housings of the respective mills are arranged so as to be connected to each other, it is possible to reduce the equipment length and the equipment cost. Also, with a thinner bar thickness than before
Since it can be sent to finishing mills, including the number of finishing mills
Mills can be reduced, which is also
It contributes to shortening. Further, the number of times of the direction change at the time of the reversing rolling can be reduced, and the idle time associated with the direction change can be shortened, and high efficiency can be achieved. At this time,
At both ends of the rolling mill, tapes are used to hold the rolled material when turning.
Cables are required, but the length of these tables
Is rolling after 2 passes of all 6 passes by horizontal mill
The length of the material, the other being as short as the length of the rolled material after 4 passes
Is enough, and the rough rolling mill including the table length
This can contribute to shortening the equipment length.

In addition, since feed rollers are provided on each of the entrance and exit sides of each mill, and side guides are provided between each of the edger mill and the horizontal mill, the rolled material is reliably guided between the rolls of each mill so that stable operation can be performed. .

Therefore, according to the present invention, it is possible to realize a small-to-medium-scale rolling equipment capable of reducing equipment costs, easily and stably operating, and producing high-quality products with high efficiency. .

Further, since the descaling header is arranged above and below each of the entrance and exit sides of the horizontal mill, the scale is prevented from being caught between the rolls of the horizontal mill, and a high quality product can be manufactured.

[Brief description of the drawings]

FIG. 1 is a view showing a rough rolling mill of a hot strip rolling equipment according to the present invention, and is a horizontal sectional view of a plane including a rolled material in the rough rolling mill.

FIG. 2 is a cross-sectional view of the rough rolling mill shown in FIG. 1 as viewed from the II-II direction.

FIG. 3 is a view showing a path flow of the entire hot strip rolling equipment provided with the rough rolling mill shown in FIGS. 1 and 2.

FIG. 4 is a diagram (rolling follow) illustrating a rolling state by the rough rolling mill in FIG. 1, in which rolling is performed toward the right side of the drawing.

FIG. 5 is a diagram showing a comparison result between the rough rolling mill shown in FIGS. 1 and 2 and a rough rolling mill according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Rough rolling mill 3 Coil box 4 Coil 5 Finish rolling mill group 6 Down coiler 7 Product coil 10a Front edger mill 10b Middle edger mill 10c Rear edger mill 11a, 11b, 11c Edger roll 12a, 12b, 12c Edger housing 20a Front surface Horizontal mill 20b Rear horizontal mill 21a, 21b Horizontal roll 22a, 22b Horizontal mill housing 30-34 Feed roller 40-43 Side guide 40A Side gutter (guide portion) 40B Opening / closing support arm 40C Drive mechanism 50 Slab 50a Rolled material (during rolling) Material) 51 Bar material 52 Hot strip 60, 61 Roll guide 70, 71 Coolant header 80, 81 Descaling header

Continuation of the front page (56) References JP-A-54-54951 (JP, A) JP-A-5-329525 (JP, A) JP-A-58-148002 (JP, A) JP-A-7-47419 (JP, A) , A) Japanese Utility Model 1988-163201 (JP, U) Japanese Utility Model Application Hei 2-42706 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 39/10 B21B 1/26 B21B 13/12 B21B 39/14 B21B 45/08

Claims (7)

(57) [Claims] In a rough rolling mill of a rolling equipment for producing a hot strip by rolling a slab, two horizontal mills are provided.
The two horizontal mills and the three edger mills are arranged alternately and the housings of each mill are connected,
A feed roller is provided on each of the entrance and exit sides of each of the three edger mills and each of the two horizontal mills, and a side guide is provided between the edger mill and the horizontal mill so as to be openable and closable and prevent meandering. , Said 3
A group of mills comprising two edger mills and two horizontal mills constitute one unit for reversing rolling. A rough rolling mill for hot strip rolling equipment. 2. The rough rolling mill of a hot strip rolling equipment according to claim 1, wherein the side guides open and close in a width direction of the material being rolled, and guide the guides from both sides thereof, and support the guides. An open / close support arm, and a drive mechanism for driving the guide unit to open / close via the open / close support arm, wherein a part of the open / close support arm passes through the housing of the horizontal mill. Rough rolling mill for strip rolling equipment. 3. The rough rolling mill of a hot strip rolling facility according to claim 1, wherein scales generated on the surface of the material being rolled are separated and removed by high-pressure water above and below each of the horizontal mills. A rough rolling mill for hot strip rolling equipment, further comprising a scaling header. 4. In a rough rolling mill of a rolling equipment for rolling a slab to produce a hot strip, two horizontal mills are provided.
The two horizontal mills and the two edger mills are arranged alternately and the housings of the respective mills are connected to each other;
A feed roller is provided on each of the two edger mills and an inlet / outlet side of each of the two horizontal mills, and a side guide for preventing meandering is provided between the edger mill and the horizontal mill. A group of mills comprising two edger mills and two horizontal mills constitute one unit for reversing rolling. A rough rolling mill for hot strip rolling equipment. 5. A rough rolling mill for rolling equipment for rolling a slab to produce a hot strip, comprising two horizontal mills.
Only, a horizontal mill and two Ejjami Le of the two,
An edger mill, a horizontal mill, a horizontal mill, and an edger mill are arranged in this order and the housings of the respective mills are connected to each other. Feed rollers are respectively provided on each of the two edger mills and on the inlet and outlet sides of each of the two horizontal mills. Side guides for preventing meandering are provided between the edger mill and the horizontal mill and between the two horizontal mills, respectively, and the two edger mills and the two horizontal mills are provided. A rough rolling mill for a hot strip rolling plant, wherein a group of mills provided constitutes one unit for reversing rolling. 6. A mill having two edger mills and two horizontal mills as one unit using a rough rolling mill of a hot strip rolling facility according to claim 4 or 5, and performing two directions. A rolling method comprising performing reversing rolling including conversion. 7. A front Ejjamiru, front horizontal mill, intermediate Ejjamiru, rear horizontal mill disposed a rear Ejjamiru that each mill housing connecting Then DOO
Prevents meandering between each edger mill and horizontal mill
For the first pass, the front edger mill, the front horizontal mill, the middle edger mill, the rear horizontal mill,
Pass the material to be rolled in the order of the rear edger mill,
Perform a first one-way tandem rolling step of reducing the sheet width direction by the front edger mill and the intermediate edger mill and reducing the sheet thickness direction by the front horizontal mill and the rear horizontal mill. The rear edge mill, the rear horizontal mill, the intermediate edge mill, the front horizontal mill, the front edge mill is passed through the material to be rolled in this order, the width reduction in the width direction by the rear edge mill and the intermediate edge mill, and the rear horizontal mill and A second one-way tandem rolling step of reducing the thickness in the thickness direction by the front horizontal mill is performed. In the final pass, the direction is further changed, and the front edge mill, the front horizontal mill, the intermediate edge mill, and the rear horizontal mill are changed. , Passing the material to be rolled in the order of the rear edger mill Rolling method which comprises carrying out the front Ejjamiru and third unidirectional tandem rolling step of performing plate thickness direction reduction by the plate width direction pressure and the front horizontal mills and the rear face horizontal mill by the intermediate Ejjamiru.