JP2532921B2 - Slab tenter rolling method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slab tenter-rolling method capable of greatly expanding the width.

[Conventional technology]

Conventionally, as a rolling method in which the direction of the slab surface is kept constant with respect to the pass direction and the rolling roll is passed a plurality of times to perform tentering, a method using tentering rolling rolls having one or two annular protrusions is known. There is. The annular protrusion is provided on the outer circumference of the body of the rolling roll, and the tip end surface thereof projects from the roll peripheral surface to form a protruding peripheral surface. This conventional method will be described with reference to FIG. 7 showing a rolling state with one rolling roll having an annular protrusion on the outer periphery of the body and FIG. 8 showing a rolling state using two rolling rolls having an annular protrusion on the outer circumference of the body.

The annular projection 4 of the conventional rolling roll with annular projection used in the conventional method is fixed to the rolling roll 5. When the annular protrusion 4 is provided at one place, it is fixed at approximately the center of the roll width as shown in FIG. 7, and the slab 1 rolled between the conventional rolling rolls 5 with the upper and lower annular protrusions 4 as described above. Since the cross-section of Fig. 7 is as shown in Fig. 7 and there are many unpressed parts, the efficiency of width expansion is low and a large width cannot be obtained. When there are two annular protrusions 4, as shown in FIG. 8, the annular protrusions 4 are fixed at positions substantially symmetrical with respect to the center of the roll width. The cross section of the slab 1 rolled between the conventional rolling rolls 5 is as shown in FIG. 8, and the plastic flow in the width center direction due to rolling is effectively prevented by the two annular protrusions 4 on the left and right. You can't get a wide width. The conventional roll roll 5 with the annular protrusion 4 has the above-mentioned drawbacks in the tenter-rolling direction.

[Problems to be Solved by the Invention]

It is an object of the present invention to provide a slab tenter-rolling method capable of greatly expanding the width without the above-mentioned drawbacks of the prior art. For this purpose, there has been a problem that it is difficult to solve in terms of the position, shape, number of annular projections, and other configurations of unknown elements for tenter rolling.

[Means for solving the problem]

As a result of various studies by the present inventors, the two-roll rolling in which the annular projection has only one place where the width of the projecting peripheral surface is fixedly limited and the positional relationship with the slab is changed and the slab passes twice The present invention has been accomplished by demonstrating that the above object can be achieved by carrying out the above and preferably by providing this range of change of the positional relationship.

That is, one aspect of the present invention is that when the slab having the width w is subjected to tenter rolling, the width G of the protruding peripheral surface formed at the tip of the annular protrusion portion provided at one outer periphery of the body portion as the tenter rolling roll is For each two passes, the center of the width of the projecting peripheral surface of the annular protrusion is alternately moved to the outside beyond the center of the width of the slab in the width direction of the slab to perform two-pass rolling. The present invention relates to a slab tenter-rolling method, which comprises rolling once with a horizontal roll after rolling. Other inventions will be clarified below.

Hereinafter, a slab tenter-rolling method according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory view showing a dimension and a positional relationship between an annular projection and a slab and a pass state at a first position in the method of the present invention, FIG. 2 is an explanatory view showing a pass state at a second position, and FIG. A cross-sectional view of the slab passed at three positions, FIG. 4 is a view showing the influence of the width of the protruding peripheral surface of the annular protrusion on the width expansion amount, and FIG. 5 is a positional relationship between the annular protrusion and the slab and the width. FIG. 6 is a diagram showing the relationship with the expansion amount, and FIG. 6 is a relationship diagram with the slab thickness and the width expansion amount.

[Description of configuration]

The tenter roll used for tenter rolling of the slab 1 in the method of the present invention is provided with one annular protrusion 3 at one outer periphery of the body of each of the upper and lower rolling rolls 2 as shown in FIG. The width G of the protruding peripheral surface 3a is equal to the width w of the slab 1. Have a relationship. When rolling the slab 1, the center of the width G of the protruding peripheral surface 3a of the annular protrusion 3 (hereinafter referred to as the annular protrusion 3
The position of 3ap may exceed either the center of the width w of the slab 1 (hereinafter sometimes abbreviated as the center of the slab 1) 1p to the left or right of the width direction of the slab 1. After passing so as to be on the outside, the next pass makes two passes on the opposite side beyond the center 1p of the width w of the slab 1 to reverse the position of the annular protrusion 3.

More specifically, the center 3ap of the width G of the protruding peripheral surface 3a of the annular protrusion 3 exceeds the center 1p of the width w of the slab 1 and is located on one side (for example, the left side) in the width direction of the slab 1 ( The first pass is performed by moving the slab 1 to the first position), and then the width w of the slab 1 with respect to the width direction of the slab 1
2) by moving to the position (called the second position) on the other side (right side when the first position is the left side) beyond the center 1p of the There is a method of rolling the material that has passed at one position once with a horizontal roll.
This is called strip rolling, and the state before rolling by horizontal rolls in this double strip rolling is shown in FIG.

In addition, the center 3ap of the width G of the protruding peripheral surface 3a of the annular projection 3 is
Is moved so that it is located at a position (first position) of one width (for example, left side) in the width direction of the slab 1 beyond the center 1p of the width w of the slab 1, and the first pass is performed. , Next, move to the position (second position) of the other width (right side when the first position is the left side) beyond the center 1p of the width w of the slab 1 in the width direction of the slab 1. After performing the second pass, the slab 1 is moved so as to be positioned at the center 1p of the width w of the slab 1 (referred to as the third position), and the third pass is performed. A method of rolling the material that has passed in one position with a horizontal roll once is called three-roll rolling, and the state before rolling by the horizontal roll in this three-roll rolling is shown in FIG. In the case of passing at three positions in this three-roll rolling, the order of passes at the first position, the second position, and the third position may be arbitrarily changed.

Then, the annular protrusion 3 at the first position and the second position
The distance δ between the center 3ap of the slab and the center 1p of the slab (hereinafter sometimes abbreviated as center-to-center distance) δ is It takes a value in the range of. It is preferable that the values of δ from the center 1p of the slab 1 to both sides are the same.

The height of the projecting peripheral surface 3a of the annular protrusion 3 from the roll surface is not particularly limited as long as it is a height of a desired reduction amount or more.

As mentioned above, the center 3ap of the annular protrusion 3 and the center 1 of the slab 1
To adjust the positional relationship with p, it is preferable to use a method in which the annular protrusion 3 is configured to be movable in the width direction of the rolling roll 2 and the annular protrusion 3 is moved. The width of the rolling roll 2, the mounting position of the annular protrusion 3, the width w of the slab 1, the center-to-center distance δ
Therefore, the position of the slab 1 may be moved in the width direction of the rolling roll 2.

As described above, a plurality of recessed lines are formed on both sides of the center 1p of the slab 1 by the first position and the second position in which the position of the center 3ap of the annular protrusion 3 is reversed as shown in FIGS. 1 and 2. The width of the slab 1 is greatly expanded by the tenter rolling. By rolling the slab 1 at each one position on both sides of the annular protrusion 3, the unpressed part of the slab 1 is reduced, and rolling at each position can be performed with one annular protrusion 3. It is thought that the plastic flow to the side of the slab 1 is facilitated due to the different rolling. After this rolling, the slab 1 having a flat surface with no ridges and having a large width is obtained by performing a single pass with a normal horizontal roll for rolling. Further, if the whole process of rolling with a horizontal roll following such rolling is repeated twice or more, a flatter metal plate with a wider width can be obtained.

The reason why the above conditions are required in the method of the present invention will be described.

about.

FIG. 4 shows that the width G of the protruding peripheral surface 3a of the annular protrusion 3 is 400 mm, 60.
Using 3 types of rolling roll 2 of 0mm and 800mm, width 1400
mm slab 1 with various center-to-center distances δ 1p center of slab 1
It is tenter rolling to form two concave shapes on both sides of the
This is a plot of the width expansion (mm) when strip rolling is performed. From Fig. 4, the width G of the protruding peripheral surface 3a is 400mm, 600m
In the case of m, a large spread amount is obtained in a certain range of the center-to-center distance δ, but in the case of 800 mm, the width spread amount is extremely small in the entire center-to-center distance δ, and the upper limit of the width G is the slab 1 700 mm (generally w /
It confirms that it is in 2). On the other hand, even if the width G of the projecting peripheral surface 3a is too small, many passes are required at each position to obtain an effective width expansion amount, which is not preferable because the temperature during rolling and the operating efficiency are reduced. The lower limit is w /
It should be 10.

next about.

FIG. 5 shows a width roll of 1400 mm which is obtained by using a tenter roll having a rolling roll 2 provided with an annular protrusion 3 having a width G of 400 mm on the protruding peripheral surface 3a.
The width expansion amount (mm) obtained by performing two-roll rolling and three-roll rolling on the slab 1 of Example 1 at various center distances δ was plotted. The center 1p of the slab 1 was made to match the center 3ap of the annular protrusion 3 (that is, only at the third position), and rolling was also performed, and this was used as a blank and shown by a circle in FIG.

In Fig. 5, in the case of two-roll rolling and three-roll rolling, the maximum width increases as the center-to-center distance δ increases from 100 mm (corresponding to G / 4) compared to the blank. After showing the amount of spread, it crawls,
If the center-to-center distance δ exceeds 600 mm [corresponding to (w / 2-G / 4)], the width expansion amount decreases sharply. And in the case of 3-roll rolling,
Regarding the center distance δ between the first position and the second position, the same effect can be obtained even if it is the same as in the double-roll rolling. This result is explained as follows. That is, the center 3a of the annular protrusion 3
When p positions are placed on each side of the center 1p of the slab 1 with a center-to-center distance δ and a pass is made for each position, if the center-to-center distance δ is less than G / 4, then there are two rolling sections. Will overlap more than G / 2, and the widening effect will be smaller. Also, In the case of, the projecting peripheral surface 3a of the annular protrusion 3 protrudes from one side end of the slab 1 by more than 1/4 of its width G, and it is wasted more than G / 2 at both ends, and thus widens the width. Will reduce the effect of. Therefore, as the center distance δ Is a desirable condition for expressing the width widening effect.

In the case of 2-roll rolling, In this case, the overlapping portion in the central portion of the slab 1 is eliminated, which is preferable. In the case of 3-roll rolling, the annular protrusion 3
In order to reduce the overlap between the other 3 paths and the center 3p of the slab 1 and the center 1p of the slab 1 Is more preferable, and when G ≦ δ, it is more preferable because there is no overlapping portion. Also, in the case of both two-roll rolling and three-roll rolling In this case, there is no protrusion of the protruding peripheral surface 3a from both side ends of the slab 1, which is preferable.

FIG. 6 shows a rolling roll 2 provided with an annular protrusion 3 having a protruding peripheral surface 3a having a width G of 300 mm and a center-to-center distance δ of 300 m.
The width w is 1200 mm as m and the slab 1 with various thicknesses is rolled down 5
This is a plot of the width expansion amount obtained by performing double rolling at 0 mm. It can be seen from FIG. 6 that, according to the method of the present invention, the thinner the slab 1 is, the larger the width expansion becomes.

〔Example〕

Hereinafter, the method of the present invention will be described more specifically with reference to Examples and Comparative Examples.

Various slabs 1 having the width w and thickness before rolling shown in the table
After being heated and extracted to 1250 ° C., a rolling roll having a diameter of 1000 mmφ was provided with movable annular projections 3 of various sizes having a width G of the protruding peripheral surface 3a having a height of 100 mm from the roll surface shown in the table. Using a tenter rolling roll and a horizontal roll with a diameter of 1000 mmφ,
The process of rolling twice or three times with a predetermined number of passes at various center distances δ and reduction amounts and then performing one pass with a horizontal roll having various reduction amounts is repeated a predetermined number of times (Example 1). ~ 8).

For comparison, rolling was performed in the same manner as in the example except that the same tenter rolling roll was used instead of two-roll rolling or three-roll rolling, and one pass was performed only at the center of the width w of the slab 1. Comparative Examples 1-2).

 The width and thickness of the obtained tentered slabs are shown in the table.

From the comparison between the examples in the table and the comparative examples, it is understood that the case of the present invention is significantly enlarged as compared with the conventional technique in which tenter rolling by the annular protrusion 3 is performed only at one central portion of the slab 1.

[Effects of the Invention] As described in detail above, according to the method of the present invention, one annular protrusion is used, and the annular slab is pressed against the slab at a specific range position on each side of the center of the slab. The width of the slab can be greatly expanded by configuring the rolling so that it can be passed at different times. Further, in the conventional tenter rolling, the width expansion of the thin slab was small, but according to the method of the present invention, the width expansion can be increased as the thickness of the slab is smaller.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the dimensions and positional relationship between the annular protrusion and the slab and the pass state at the first position in the present invention,
FIG. 2 is an explanatory view showing a pass state at the second position, and FIG.
The figure is a cross-sectional view of the slab that has passed at three positions. Fig. 4 is a view showing the influence of the width of the protruding peripheral surface of the annular protrusion on the width expansion amount. Fig. 5 is the positional relationship between the annular protrusion and the slab. And FIG. 6 is a diagram showing the relationship between the width of the slab and FIG. 6 is a diagram showing the relationship between the thickness of the slab and the width of the slab, and FIG. FIG. 8 is a view showing a rolling state by two tenter rolls with an annular protrusion. 1 ...... slab 1p ...... width center 2 ...... rolling roll 3 ...... annular protrusion 3a …… protruding peripheral surface 3ap …… protrusion peripheral width center 4 …… conventional annular protrusion 5 …… conventional Rolling roll

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Aizawa 11-11 Showa-cho, Kure-shi, Hiroshima Nisshin Steel Co., Ltd. Kure Research Institute (56) References Japanese Patent Publication Sho 56-12361 (JP, B2)

Claims (6)

(57) [Claims] 1. A protrusion formed at the tip of an annular projection (3) at one outer periphery of a body as a tenter rolling roll (2) when tentering a slab (1) having a width (w). The width (G) of the peripheral surface (3a) is For each pass, the center (3ap) of the width (G) of the protruding peripheral surface (3a) of the annular projection (3) is set to the slab (1) in the width direction of the slab (1) for each pass. A slab tenter-rolling method, characterized in that the slab is rolled by performing two passes of rolling by alternately moving to the outside of the center of the width (w), and then rolling once with a horizontal roll. 2. The projecting peripheral surface (3) of the annular projection (3) during or at the end of two-pass rolling by the tenter roll (2).
Width (w) of slab (1) at the center (3ap) of width (G) of a)
The slab tenter-rolling method according to claim 1, wherein the slab tenter rolling is performed by moving the slab so that the slab is located at the center (1p). 3. A slab tenter-rolling method according to claim 1 or 2, wherein all steps of rolling with two- or three-pass tenter-rolling rolls (2) and rolling with horizontal rolls are repeated twice or more. 4. A protrusion formed at the tip of an annular protrusion (3) provided at one outer periphery of the body as a tenter rolling roll (2) during tenter rolling of a slab (1) having a width (w). The width (G) of the peripheral surface (3a) is The distance (δ) from the center (1p) of the width (w) of the slab (1) to the center (3ap) of the width (G) of the protruding peripheral surface (3a) is used for each pass. In the range of the width of the slab (1), it is moved outwardly beyond the center of the width (w) of the slab (1) to perform two passes of rolling and then one pass with a horizontal roll. A slab tenter-rolling method, which comprises rolling and rolling. 5. The projecting peripheral surface (3) of the annular projection (3) during or at the end of two-pass rolling by the tenter roll (2).
Width (w) of slab (1) at the center (3ap) of width (G) of a)
The slab tenter-rolling method according to claim 4, wherein the slab is moved so as to be located at the center (1p) position of the slab. 6. The slab tenter-rolling method according to claim 4 or 5, wherein all the steps of rolling with the two-pass or ten-pass tenter rolls (2) and horizontal rolls are repeated twice or more.