JPH0751702A - Rolling method and rolling equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To enable stable width adjustment even for thin slabs. [Structure] The taper roll mill 4, the flat roll mill 2 and the edger 1 are arranged in a line. Taper roll mill 4 by alternately feeding slab 3 sequentially, backward, and forward
And flat roll mill 2 to reduce the thickness and widen the width. The width of the slab 3 is controlled by the edger 1 to control the width. The width reduction by the edger 1 is forcibly performed once or, if necessary, performed once or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method and rolling equipment for rough rolling a hot slab.

[0002]

2. Description of the Related Art In order to make a hot slab into a product having a predetermined plate width and plate thickness, it is usually necessary to perform a rough rolling process before performing a finish rolling process.

The conventional equipment for carrying out the rough rolling process of the hot slab is an edger 1 as shown in the outline of an example in FIG.
And a 4Hi (or 2Hi) flat roll mill 2 are arranged in tandem, and a slab 3 which has been subjected to a strong width reduction by a width press device (not shown) is used as an edger 1 and a flat roll mill 2.
By successively passing through, the width reduction and the thickness reduction are repeated to process into a predetermined size (JP-A-1-107905).

[0004]

However, in the case of the above-mentioned conventional equipment, since the width adjustment range is small only by combining the edger 1 and the flat roll mill 2, a multi-stage arrangement is provided in order to accommodate slabs 3 of all sizes. There is a problem that the line length becomes long.

For this reason, there are facilities equipped with a heavy edger or a sizing press, but in the heavy edger and sizing press, when the slab becomes thinner, the slab buckles and stable width reduction cannot be performed. Heavy edgers and sizing presses are expensive.

[0006] Therefore, the present invention is a relatively inexpensive equipment,
It is intended to widen the width adjustment range so that the width can be stably adjusted even with a thin slab (or bar).

[0007]

In order to solve the above-mentioned problems, the present invention reduces the thickness of a slab with a taper roll mill and then reduces the thickness with a flat roll mill to widen the width,
Next, the flat roll mill and the taper roll mill are reversed to widen the width by feeding the slab backwards, and further, the taper roll mill and the flat roll mill are normally rotated in the final pass to sequentially feed the slab to widen the width. And the rolling method.

Before expanding the width of the slab in the final pass,
The slab is rolled down by an edger to adjust the width.

Further, the taper roll mill, the flat roll mill and the edger are arranged in a line, and at least the taper roll mill and the flat roll mill are arranged in tandem.

[0010]

When the slab is fed to the taper roll mill and the flat roll mill in order, the reverse feed and the forward feed to perform the thickness reduction, the width can be easily widened and a predetermined plate thickness can be obtained in a short line. Further, the width of the slab can be adjusted by applying a width reduction to the slab with an edger during each feed for performing the thickness reduction.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 (a), (b) and (c) of FIG. 1 show an embodiment of the rolling equipment of the present invention, which is a 2Hi taper roll mill 4 having taper rolls having tapered portions at both ends and an edger. 1 and 4Hi flat roll mills 2 which can be reversibly driven, and the taper roll mill 4, the edger 1, and the flat roll mill 2 are tandem-arranged in a row along the conveying direction of the hot slab 3. The configuration. The flat roll of the flat roll mill 2 may have an initial crown.

When the slab 3 is roughly rolled by the rolling equipment having the above-mentioned structure, the slab 3 is alternately fed in the reverse direction, fed in the reverse direction and tapered in the forward direction as shown in the route diagram of FIG. The roll mill 4 and the flat roll mill 2 sequentially perform thickness reduction. Further, the width reduction of the slab 3 is performed once or more by the edger 1 during each of the above feedings, if necessary. That is, first, as a first pass, the taper roll mill 4 and the flat roll mill 2 are normally rotated to reduce the thickness of the slab 3 by the taper roll mill 4 and then the flat roll mill 2 to reduce the thickness to widen the width. As a pass, the flat roll mill 2 and the taper roll mill 4 are reversed, and the slab 3 is reduced in thickness by the flat roll mill 2 and the taper roll mill 4 to widen the width. At this time, depending on the width expansion state of the slab 3 after the first pass, the width of the slab 3 may be reduced by the edger 1 between the flat roll mill 2 and the taper roll mill 4 to adjust the width, if necessary. . Furthermore, as the final pass,
The taper roll mill 4 and the flat roll mill 2 are rotated in the forward direction, the slab 3 is sequentially fed, and the taper roll mill 4 and the flat roll mill 2 are pressed down to widen the width. Further, at this time, depending on the width expansion state of the slab 3 after the reverse pass, the width of the slab 3 is controlled by the edger 1 between the taper roll mill 4 and the flat roll mill 2 to control the width, if necessary. . In addition, the ● mark in the route line indicates the place where the reduction is performed, and the ○ mark indicates the place where the reduction is performed as necessary.

As described above, since the taper roll mill 4 and the flat roll mill 2 perform the thickness reduction of the slab 3 in the order of forward, reverse, and sequential, the line length of the entire equipment can be shortened. At this time, the taper roll mill 4 and the flat roll mill 2 can be used to change the cross section of the slab 3 as shown in (a), (b) and (c) of FIG. There is. Further, during each of the above-mentioned feeds, the edger 1 is caused to perform the width reduction of the slab 3 as necessary,
The width of the slab 3 can be controlled to a predetermined size.

Next, (a) and (b) of FIG. 3 show another embodiment of the present invention. In the same construction as the embodiment shown in (a) and (b) of FIG. The positions of the edger 1 and the edger 1 are reversely arranged, and the width of the slab 3 is reduced by the edger 1 at the time of the final pass by progressive feeding to control the width.

FIGS. 4A and 4B show still another embodiment of the present invention. In the same construction as the embodiment shown in FIGS. 1A and 1B, the edger 1 and the flat roll mill are used. The position of 2 is reversed, and the edger 1 is used as needed.

Further, (a) and (b) of FIG. 5 show still another embodiment of the present invention. Only the edger 1 has the same construction as the embodiment shown in (a) and (b) of FIG. Are independently arranged at the entrance of the finishing mill group 5, and the edger 1 is used as needed.

Also in the embodiment shown in FIGS. 3 to 5, FIG.
The same effects and advantages as in the case of the above embodiment can be obtained.

In each of the above-mentioned embodiments, the case where the width of the slab 3 is widened is mainly shown. However, when the width is mainly killed, the taper roll mill 4 is not used. What you can do, and in the example,
The flat roll mill 2 showed the case of 4Hi, but 2H
Of course, i may be used, and various changes can be made without departing from the scope of the present invention.

[0020]

As described above, according to the present invention, the slab is alternately fed to the taper roll mill and the flat roll mill in the order of forward feed, reverse feed and forward feed, and the taper roll mill and the flat roll mill are subjected to width reduction. The equipment line length can be shortened and the equipment cost can be reduced, the width of the slab can be easily widened, and the width of the slab can be controlled by applying the width reduction by the edger. Even for thin slabs where it is difficult to use a press or mill for width reduction,
It has an excellent effect that the width can be adjusted stably.

[Brief description of drawings]

FIG. 1 shows an embodiment of rolling equipment of the present invention,
(A) is a schematic side view showing a line configuration, (B) is a path diagram of a slab, and (C) is a schematic front view of a taper roll mill corresponding to the arrow A-A of (A).

FIG. 2 shows a cross-sectional shape of the slab.
(C) is an explanatory view showing a state in which the shape is sequentially changed.

FIG. 3 shows another embodiment of the present invention, in which (a) is a schematic side view showing a line configuration, and (b) is a route diagram of a slab.

FIG. 4 shows still another embodiment of the present invention.
Is a schematic side view showing the line configuration, and (b) is a path diagram of the slab.

FIG. 5 shows still another embodiment of the present invention.
Is a schematic side view showing the line configuration, and (b) is a path diagram of the slab.

FIG. 6 is a schematic view showing an example of conventional equipment for roughly rolling a slab.

[Explanation of symbols]

 1 Edger 2 Flat roll mill 3 Slab 4 Taper roll mill

Claims (3)

[Claims] 1. A slab is reduced in thickness by a taper roll mill and then reduced in thickness by a flat roll mill to widen its width,
Next, the flat roll mill and the taper roll mill are reversed to widen the width by feeding the slab backwards, and further, the taper roll mill and the flat roll mill are normally rotated in the final pass to sequentially feed the slab to widen the width. Rolling method. 2. The rolling method according to claim 1, wherein before the width of the slab is widened in the final pass, the slab is subjected to width reduction by an edger to adjust the width. 3. A rolling facility comprising a taper roll mill, a flat roll mill and an edger arranged in a line, and at least the taper roll mill and the flat roll mill are arranged in tandem.