JPS59199104A - Train of strip manufacturing device - Google Patents

Abstract

PURPOSE:To manufacture a hot strip by an inexpensive installation by continuously rolling a thin cast billet cast by a continuous casting machine with the aid of a large diametral work roll and plural small diametral work rolls provided to the outer circumference of the large one. CONSTITUTION:A coil of a thin slab 4 having 20-50mm. thickness manufactured by a continuous casting method is unwound from an unwinding device 2 and is supplied to a mill 1 consisting of a large diametral work roll W and three small diametral work rolls W-1, W-2, and W-3. The number of revolutions of each of the three small rolls is made larger with the order of W-1, W-2, and W-3, and each of the roll gaps is made smaller with the same order. By rolling the slab 4 in sequence with the aids of the roll W and the three small rolls, the slab 4 is easily rolled into a hot strip without wrapping around the large roll W with the aid of a strip guide 5, and the strip is smoothly wound up without producing upward or downward nip bending at the front or rear end of strip with the aid of a device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the manufacture of a 20 to 5
This relates to a strip manufacturing equipment array that finishes thin slabs with a thickness of QNm into strips with a simple equipment configuration.

Conventionally, hot strip mills that perform hot rolling from slabs to hot strips consist of a row of roughing mills and a row of finishing mills, and require 8 to 15 rolling mills, and the total length of the line is 300 to 500 m. It is an extremely large facility, requiring a vast amount of space and huge equipment costs.

On the other hand, in recent years, technological improvements in continuous casting have made it possible to produce thin slabs that are a fraction of the thickness of conventional castings (20 to 50 mm thick), and it is now possible to finish these thin slabs into hot strips with low equipment costs. Development of rolling equipment is desired.

In addition, as an alternative to the hot strip mill, there are rolling mills consisting of planetary mills and planishing mills, but these rolling mills are cheaper than hot strip mills and suitable for small-scale production, but on the other hand, Since planetary mills are mechanically similar to forging using rolls, they generate very loud noises, and the edges of the rolled material are V-shaped, which has the disadvantage of reducing yields by requiring trimming. moreover,
The characteristics of planetary mills include thin materials and wide materials (for example, 4
Rolling with a thickness of 0 (thickness x 1,250 width) is impossible because the work roll has to be made extremely fine due to its mechanism and does not have enough strength.

This invention has been made in view of the above-mentioned conventional circumstances, and provides a strip manufacturing apparatus that can finish thin slabs of 20 to 5 Q ml thickness manufactured by continuous casting into hot strips at low equipment costs. It suggests columns.

The gist of this invention is to arrange a plurality of small-diameter work rolls on a part of the outer periphery of one large-diameter work roll so that the roll gap can be adjusted, and to increase the circumferential speed of the plurality of small-diameter work rolls toward the exit side. The rolling mill is equipped with a mechanism for rolling the plate so that the thickness is gradually reduced between the large-diameter work roll and each small-diameter work roll at high speed, and a coil unwinding device in front of the entrance side of the rolling mill. The strip manufacturing apparatus array is characterized in that a coil winding device is disposed at the rear of the exit side, or a leveler device and/or a skin pass rolling mill are respectively disposed between the rolling mill and the coil winding device.

That is, the main feature of this invention is that the material can be rolled to a predetermined thickness using a single rolling mill, and the material is rewound from a coil unwinding device installed in front of the rolling mill. This is a method in which a strip is finished to a predetermined thickness using a single rolling mill, and a strip of the predetermined thickness is wound using a coil winding device installed at the rear of the rolling mill.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a mounting plate according to an embodiment of the present invention will be described based on the drawings.

In FIG. 1, (1) is a rolling mill, (2) is a coil unwinding device, and (3) is a coil winding device. A store rolling machine (1) according to the present invention has three small diameter warn rolls (W-1) to (W-3) arranged on a part of the outer periphery of a large diameter work roll (W), and the large diameter work roll ('W) and each of the small diameter work rolls (W-1) to (w-3), the rolling mechanism is such that the thickness of the plate is gradually reduced. ) to (W-3) are respectively incorporated into individual chocks (7-1) to (7-3) to move up and down, and small-diameter work rolls (w-1) to (W-
3) The circumferential speed increases at a constant speed from the input side to the output side, and the roll gap with the large diameter work roll (W) gradually decreases from the input side to the output side, i.e. The plate thickness is arranged so that it decreases from the entry side to the exit side. In addition, considering the biting property of the rolled material (4), the small diameter work roll (W-1) on the entry side
The outer diameter of the roll is larger than that of the small diameter work rolls (W-2) and (W-3) on the exit side. Alternatively, in order to further improve the biting property, the small diameter roll on the entry side is subjected to any one of knurling, corrosive processing, dull processing, etc. (
5) is a strip guide for preventing the rolled material (4) from being wrapped around the large-diameter work roll (W), and (6) is a strip guide provided above and below the rolling material (4) with the line in between. This is a device for preventing nose rise and nose drop, which is made of a presser roll that can be raised and lowered, for example, to prevent nose rise and nose drop.

In the above equipment row, the rolling mill (4) for rolling thin slabs after continuous casting is unwound by the coil unwinding device (2), and the large-diameter work roll ('W) of the rolling mill (1) is rolled up. Rolling is applied in stages between three small-diameter work rolls (w-1) to (w-3) to reduce the thickness of the sheet, and the sheet is rolled into a strip having a predetermined thickness. The leading end of the rolled strip is prevented from winding around the large-diameter work roll (W) by a strip guide (5) on the exit side of the rolling machine, and is prevented from winding around the large-diameter work roll (W).
) by moving the strip up and down, the strip is transported horizontally and then wound onto a coil winding device (3).

Figure 2 shows a rolling mill (1-
2), the structure of the rolling mill (1-2) consists of large-diameter work rolls (W
-2) Assemble the three small-diameter work rolls (w-i) to (W-3) arranged on a part of the outer circumference into individual small chocks (7'-1) to (7'-3), respectively. At the same time, each chock is further assembled into a large chock (ge), and the entire small-diameter work roll is moved up and down by the large chock (7), and each small-diameter work roll is rolled down individually by the small chocks (7'-i) to (7).
'-:3). (b-
i) to (b-S) are small diameter work rolls (W-i) to (W
- This is a backup role for i). In the case of a rolling mill having such a structure, a deflector roll (8) can be provided on the entrance side of the rolling mill so that the entrance angle of the rolled material (4-2) can be freely changed.

In the above device row, the rolled material (4-2) unwinded from the coil unwinding device (2-2) is deflected by the deflector roll (8).
), the large-diameter work roll (
W-2) and three small diameter work rolls (w-i) to (w-
S) is applied stepwise to reduce the plate thickness, and after being rolled into a strip of a predetermined thickness, it is wound in a coil winding device (3-2). Large diameter work roll (W-2> and each small diameter work roll (wr) ~ (
The roll gap between w-6) is determined according to the thickness of the material.

Figure 3 shows a rolling mill (
1-3), the structure of the rolling mill (1-3) is such that a backup roll (B) is also provided for the large-diameter work roll (W-3), The upper roll consists of two small diameter work rolls (w-X) (w-
S) is incorporated into a single chock (7) that can move vertically and horizontally, and by moving this chock (7) vertically and horizontally (in the direction of sheet threading) as shown by the arrows, the reduction amount can be adjusted. You can freely select the reduction amount distribution between the left and right small-diameter work rolls. (b-1) (b-5) is a backup roll for the small-diameter work rolls (w-1) and (W-2).

In the case of the above device row, the rolled material (4-3) that is unwound by the coil unwinding device (2-3) is a large-diameter work roll (W-3).
) and two small-diameter work rolls (W-1) (W-2) to finish the strip into a predetermined thickness, which is then wound into a coil winding device (3-3). .

Figure 4 shows the line configuration when using a rolling mill in which the inlet and outlet sides are located in the same vertical plane, where (1-4) is the rolling mill and (2-4) is the coil unwinding device. , (3-4) is a coil winding device, (8) is a leveler device, and (9) is a cooling device. The rolling mill (1-4) has large diameter work rolls (W-
4) Five small diameter work rolls (
w-1) to (W-5) are arranged, and each small-diameter work roll is incorporated into an individual chock (W-1) to (5-5) together with backup rolls (b-1) to (b-π). The guide roller (10) is configured to operate in the rolling direction, and between the small diameter work rails is a guide roller (10) consisting of a plurality of rollers for guiding the rolled material (4-4) to the subsequent rolling roll.
In addition, a strip guide (5-4) to prevent wrapping and a device to prevent nose up/down (b-4) are installed on the exit side.
has been established.

That is, the rolled material (4-4) unwound by the coil unwinding device (2-4) is corrected for winding curls by the leveler device (11), and then rolled to each small diameter work roll (W-1) to (W −
5) One large diameter work roll (W-4) and each small diameter work roll (W
-1) to (W-5) are rolled into a strip of desired thickness. On the exit side of the rolling mill (1-4), the strip is
Large diameter roll (W-4) by strip guide (5-4)
), and prevents the device from getting wrapped around the nose (
b-4), then cooled to a desired temperature by a cooling device (9) such as a spray or film cooling method, and then corrected by a leveler device (8) to correct flatness defects that occurred during cooling. The coil is then wound up by a coil winding device (3-4). If necessary, a leveler may be installed immediately after the nose rise/nose fall prevention device.

In the case of this equipment row, since the coil can be unwound and wound on the front side of the rolling mill, it is more advantageous in terms of space than the arrangement illustrated in FIGS. 1 to 3. Note that instead of the leveler device (8) on the exit side of the rolling mill, a two-stage or multi-stage skin pass rolling mill, preferably a roll bender, an intermediate roll shift, a variable crown roll, etc., capable of performing known roll crown control, is used. The flatness may be corrected by applying a light reduction to the cooled strip, or by installing both a leveler device and a skin pass rolling mill in the flatness row, and then rolling the strip in a heat holding furnace or the like before the unwinding device. Alternatively, a heating furnace may be provided, and if necessary, the hot thin slab coil after casting is heated and then rolled while being unwound, or the coil may be heated to a predetermined temperature in a heating furnace and then rolled.

It goes without saying that the unwinding device on the entry side may be omitted and a cooling device, a leveler device, and/or a skin pass rolling mill, etc. may be provided between the slab-like thin casting side and the winding device as required.

Next, embodiments of the invention will be described.

[Example 1] A slab manufactured by continuous casting with a thickness of 40mm and a width of 1000cm was heated, and a slab with an O-# diameter of 2000yttm and a Rono V body length of 180mm (1+i) was heated and placed in the upper part of the outer periphery of a large diameter work roll. Roll diameter 250 mW 1250 MM from the side,
Hot rolling was carried out using a rolling mill shown in FIG. 1, which was configured with three small-diameter work rolls of 130 WWI. The heating temperature at that time is 1100-1200°C 1 winding temperature is 55
The temperature was 0 to 700°C.

As a result, a maximum reduction rate of 80% was obtained, and the plate thickness ranged from 8 to 18
We were able to produce hot-rolled steel sheets of the highest quality.

[Example 2] The roll diameter is 200" from the entrance side to the upper part of the outer station of a large diameter work roll with a roll diameter of 1800 m* and an o-le body length of 1500 NM.
, l 50 '', and 100 ysw, and a deflation roll with a roll diameter of 300 fins on the entry side was used.
The same slab was rolled under the same hot rolling conditions.

As a result, a maximum rolling reduction of 90% was obtained, and the plate thickness was 4 to 10%.
We were able to produce hot-rolled steel plates for the related parts.

[Example 3] A third work roll was constructed by disposing two small diameter work rolls with roll diameters of 50 mm and 30 mm from the entry side on the upper outer circumference of a large diameter work roll with a roll diameter of 200 mm and a roll body length of 300 mm. Using the rolling mill shown in the figure (however, an 8 m long heating furnace was installed on the input side), a 10 m thick x 3 mm hot rolled coil was hot rolled while being heated on the input side of the mill.

As a result, a maximum rolling reduction of 90% was obtained, and the plate thickness ranged from 1.0 to
It was possible to produce a hot-rolled steel sheet of 2my+.

[Example 4] Roll diameter 2000 yim 1 Roll body length 1500 mm 5 small diameters of roll diameters 300 mm, 250 mm, 200 HIIt1150 mm, 100 Ytttn The same slab as in Example 1 was hot-rolled under the same conditions using the rolling mill shown in FIG.

As a result, a maximum rolling reduction of 95% was obtained, and hot-rolled steel sheets with a thickness of 2 to 6 mm could be manufactured.

As is clear from the embodiments described above, the rolling mill according to the present invention is capable of heavy reduction rolling with one stand.
Therefore, unlike a conventional hot strip mill, large-scale equipment is not required, and a strip of 20 to 50 mm thick produced by a continuous casting method can be finished into a hot rolled steel plate with a low investment.

Although the detailed description of the present invention has been described above with reference to hot rolling, it goes without saying that the apparatus array of the present invention can also be applied to cold rolling.

[Brief explanation of the drawing]

1 to 4 are schematic diagrams showing embodiments of the device of the present invention. 1, 1-2.1-3.1-4...Rolling mill, 2.2-
2.2-3゜2-4... Coil unwinding device, 3.3-
2.3-3.3-4...Coil winding device, 4...Rolled material, W, W-2, W-3, W-4...Large diameter work roll, NVl, W1 ．． V/lp” 1
e W-2pW-2, W-2,' W-2, W-3,
W-3, W-3, W-3, 'W-4, W-5...Small diameter work roll, b-1, b-1, b-1, b-L b-
2゜b-2, b-2, b-2, b-3, b-3, b-3
, b-3, b-4, b-5°B...Backup roll. Applicant Sumitomo Metal Industries Co., Ltd. Agent 1) Yoshihisa 177ゝ7°)-1.
-1 Figure 1 Figure 2 Figure 84 Figure 23-

Claims (1)

[Claims] A plurality of small-diameter work rolls are arranged on a part of the outer periphery of one large-diameter work roll so that the roll gap can be adjusted, and the circumferential speed of the plurality of small-diameter work rolls is increased toward the exit side. The rolling mill is equipped with a mechanism for rolling the plate so that the thickness is gradually reduced between the large-diameter work roll and each small-diameter work roll at a relatively high speed, and a coil unwinding device is installed in front of the entrance side of the rolling mill. , a strip manufacturing equipment array characterized in that a coil winding device is arranged at the rear of the exit side. 2. A plurality of small-diameter work rolls are arranged on a part of the outer periphery of one large-diameter work roll so that the roll gap can be adjusted, and the circumferential speed of the plurality of small-diameter work rolls is made higher toward the exit side, and the above-mentioned The rolling mill is equipped with a mechanism for rolling the plate so that the thickness is gradually reduced between a large-diameter work roll and each small-diameter work roll. 1. A strip manufacturing apparatus array comprising a winding device, and a leveler device and/or a skin pass rolling mill each disposed between the rolling mill and the coil winding device.