JPH03238102A - Rolling method and device thereof - Google Patents

Abstract

PURPOSE:To prevent the generation of a nose bending and chamber in a rolled stock and to improve product quality by applying a tension to the rolled stock by the circumferential speed difference between the vertical rolls of a vertical rolling mill and the work rolls of a horizontal rolling mill, and thereby horizontally rolling the rolled stock together with edging. CONSTITUTION:At the time of rolling, the forward tension is applied on the rolled stock S by the vertical type rolling mill 6 disposed vertically on the upstream of the rolling line direction D1 of the horizontal rolling mill 1. The edging draft of the rolled stock S is, therefore, good and the production efficiency is improved. The vertical rolls 7a, 7b of the vertical rolling mill 6 are shifted in the transverse direction of the rolled stock S or in the direction parallel with the rolling line direction D1 if an offcenter is generated in the rolled stock S. The rolled stock S is supplied to the horizontal rolling mill 1 and the vertical rolling mill 9 on the exit side of this rolling mill in the state of not generating the chamber and nose bending at the front end of the rolled stock S before the stock is introduced into the horizontal rolling mill 1. The good-quality product having the above-mentioned characteristics is, therefore, obtd.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a rolling method and an apparatus therefor.

[Prior Art] An example of a hot rolling line that performs width reduction and rough horizontal rolling is disclosed in Japanese Patent Publication No. Sho H-29607. To explain such an apparatus with reference to FIG. 6, there are vertical rolling mills upstream and downstream of the rough horizontal rolling mill a in the rolling line direction D1, and c.
Conventionally, rebus rolling has been performed by disposing a rolling material S and reciprocating the rolled material S in the rolling line direction D1 or in a direction D2 opposite to the rolling line direction D1.

In the above hot rolling line, for example, when the rolled material S is width-reduced by a vertical rolling mill and rolled in the thickness direction by a rough horizontal rolling mill a, the rolled material S which has been width-reduced by the vertical rolling mill a is , as shown in FIG. 7(A), a camber dl occurs in which the entire rolled material S bends with a large radius of curvature in the width direction,
Alternatively, as shown in FIG. 7(B), the leading end of the rolled material S may have a nose bend d2 that is largely bent in the width direction.

The reason why such camber dl or nose curve d2 occurs is considered to be as follows. That is, as shown in FIG. 8(a), the left corner of the tip of the rolled material S which is off-centered to the left in the rolling line direction D1 with respect to the rolling line center e by a distance fikx is located at the vertical roll r of the vertical rolling mill. , r, when it comes into contact with the left vertical roll r, the rolled material S is pushed by the vertical roll r without deformation and is tilted with respect to the rolling line e when viewed in plan, as shown in FIG. 8(b). It is tilted by an angle θ, and in this state is caught between the left and right vertical rolls r and r'.

When the rolled material S is bitten between the vertical rolls f and f' with an inclination angle θ, the width reduction amount A W + of the right corner of the tip of the rolled material S is as shown in FIG. 8(c). Because the width reduction is large and the width reduction amount IJW2 of the left corner part is small,
The rolled material S may be bent sideways to the off-center side as shown by the imaginary line A in FIG. 8(C), resulting in a camber dl as shown in FIG. At the same time as it curves sideways to the off-center side, the rotational moment M (see Figure 8 (c)) due to the width reduction blade acts on the tip of the rolled material S, and the inclination angle θ of the rolled material S is reduced at the entrance side of the vertical rolling mill. The rolled material S is moved in the direction in which the value becomes smaller (counterclockwise direction in Fig. 8 (c)).
rotates, and as a result, the lateral bending of the rolled material S is limited to the tip, and when this part is bitten by the rough horizontal rolling mill a, the lateral bending of the tip is emphasized, resulting in a roll as shown in Figure 7 (b). crooked nose d2
may occur.

As mentioned above, the rolled material S has a camber dl.
Even if an attempt is made to reduce the width of the rolled material S coming out of the rough horizontal rolling mill a, the leading edge of the rolled material S will not fit into the left and right verticals of the vertical rolling mill C shown in FIG. roll 91g
There is a risk that various troubles may occur if the system is not introduced smoothly during the process. Therefore, conventionally, when the rolled material S is fed in the rolling line direction D1 as shown in FIG. 6, the vertical roll 99g' of the vertical rolling mill C is moved back in a direction away from the width direction of the rolled material S. The rolled material S coming out of the rough horizontal rolling mill a is not subjected to width reduction in the vertical rolling mill C, and after the rear end of the rolled material S reaches the downstream side of the rolling line direction D1 from the vertical rolling mill C, When the rolled material S is subjected to feed width reduction and rough horizontal rolling in the direction I)2 opposite to the rolling line direction D1, the width reduction is performed by the vertical rolling mill C. Further, in this case, the vertical rolls f, f'' of the vertical rolling mill are kept away from both sides of the rolled material S in the width direction so as not to interfere with the camber or nose curve produced at the tip of the rolled material S in the direction D2.

[Problems to be Solved by the Invention] However, in the above-mentioned apparatus, the width of the rolled material S can only be reduced by the vertical rolling mill or C located upstream with respect to the feeding direction of the rolling mill S. The production efficiency was poor, and it was not possible to prevent the rolled material S from having curved nose or camber.

In view of the above-mentioned circumstances, the present invention improves production efficiency by performing width reduction using both vertical rolling mills installed upstream and downstream in the rolling line direction of a horizontal rolling mill in one pass. The purpose of this invention is to improve the quality of the product by preventing the occurrence of nose bending and camber in the rolled material.

[Means for Solving the Problems] The present invention provides tension in a rolled material due to the circumferential speed difference between the vertical rolling mill vertical rolls disposed upstream and downstream in the rolling line direction of the horizontal rolling mill and the horizontal rolling mill work rolls. The rolled material is width-reduced and horizontally rolled, and the rolled material is provided with vertical rolling mill vertical rolls disposed upstream and downstream in the rolling line direction of the horizontal rolling mill and the horizontal rolling mill work. By applying tension by the difference in circumferential speed between the rolls, when the rolled material is rolled down in width and horizontally rolled, the center between the vertical rolls is is aligned with the center in the width direction of the rolling mill, and furthermore, due to the circumferential speed difference between the vertical rolling mill vertical rolls disposed upstream and downstream in the rolling line direction of the horizontal rolling mill and the horizontal rolling mill work rom, By applying tension, the vertical rolling mill vertical rolls are moved in the direction of the rolling line when the rolled material is width-reduced and horizontally rolled. "Rolling line direction of horizontal rolling mill" - A vertical rolling mill equipped with vertical rolls that are disposed on the downstream side and can be shifted in the width direction of the rolled material while maintaining the same spacing, and furthermore, It is equipped with a horizontal rolling mill equipped with rolls, and a vertical rolling mill equipped with vertical rolls that are disposed upstream and downstream of the horizontal rolling mill in the rolling line direction and can be shifted in a direction parallel to the rolling line direction. .

[Function] During rolling, forward tension is applied to the rolled material by the vertical rolling mill installed upstream of the horizontal rolling mill in the rolling line direction, so the width reduction ratio of the rolled material is good and production efficiency is improved. do.

In addition, if the rolled material is off-center, the vertical rolls of the vertical rolling mill may be shifted in the direction parallel to the rolling margin direction or the rolling line direction, thereby improving the quality of the rolled material before it is introduced into the horizontal rolling mill. The rolled material can be fed to a horizontal rolling mill or a vertical rolling mill on the exit side of the horizontal rolling mill with only camber or nose bending occurring at the tip end.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 and 2 show one embodiment of the present invention, in which reference numeral 1 denotes a rough roller equipped with a pair of upper and lower work rolls 2.3 and a pair of upper and lower backing rolls 4.5 for backing up the work rolls 2.3. A horizontal rolling mill 6 is a vertical rolling mill disposed upstream of the rough horizontal rolling mill 1 in the rolling line direction D1 and is provided with a pair of left and right vertical rolls 7a and 7b; 8 is a vertical rolling mill in the rolling line direction of the rough horizontal rolling mill 1; A pair of left and right vertical rolls 9a, 9 arranged on the downstream side of D1
The vertical rolling mill 6.8 has vertical rolls 7a, 7b, 9a, and 9b as in the conventional one.
Close to the width direction of the rolled material S by a screw shaft (not shown),
In addition to being able to separate, it is also possible to perform automatic plate width control using a reduction cylinder (not shown), and actuators such as hydraulic cylinders lOa, 10b
1la, llb vertical rolls 7a, 7b, 9a,
Is 9b a vertical roll? The rolled material S is shifted in the width direction while maintaining the distances between a and 7b and between 9a and 9b constant.

12a, 12b, 13a, 13b are arranged between the vertical rolling mill 6 and the rough horizontal rolling mill 1, and between the rough horizontal rolling mill 1 and the vertical rolling mill 8, and the actuators 14a, 14b, 1
5a.

A side guide, lea, leb, 17a, which can move toward and away from the width end of the rolled material S by means of 15b.
.

17b is the side guide 12a, 12b, 13a,
These are vertical guide rollers rotatably provided on both sides of the side guides 12a, 12b, 13a,
13b and vertical guide roller lea, 16b, 1
Centering and guiding of the rolled material S can be performed by 7a and 17b.

1849 is rolling line direction D1 than vertical rolling mill 6.8
A lateral deviation detector 18, 19 is disposed on the upstream side or downstream side and is capable of detecting the off-center amount X of the rolled material S, and the lateral deviation detectors 18 and 19 are configured by conventionally known means such as an industrial camera. has been done.

Reference numeral 20 denotes an arithmetic device which can calculate the off-center aX and one direction of the off-center of the rolled material S with respect to the center e of the rolling line based on the signal 1 or v2 from the lateral deviation detector 18 or 19. Further, the calculation device 20 is equipped with a switching device, and
The control is performed based on the signal v1 from the lateral slip detector 18, or Signal from lateral shift detector 19 ■
2, it is possible to select whether the control is performed or not.

21a, 21b, 22a, 22b are actuators 1
0a.

10b, lla, llb, and when the actuators 10a, 10b, lla, llb are hydraulic cylinders, valves such as servo valves are used.

Next, the operation of the present invention will be explained.

For example, when performing width reduction and rough horizontal rolling of the rolled material S sent in the rolling line direction D7, the off-center amount X can be calculated by switching the calculation device 20 and using the signal 1 from the lateral deviation detector 18. The left and right vertical rolls 7a and 7b of each vertical rolling mill 6.8 are connected by screw shafts (not shown).
Gap G+, G2 (G+
> 02) is adjusted to a predetermined interval corresponding to the plate width and width reduction amount.
15b between side guides L2a and 12b and side guide lla.

The gap between lsb is adjusted to a predetermined interval corresponding to the plate width, and the gap between the work rolls 2 and 3 of the rough horizontal rolling mill 1 is adjusted to the interval corresponding to the thickness of the plate after rough horizontal rolling. .

When the rolled material S sent from the upstream side of the rolling line direction D1 passes through the side slip detector 18, the side slip detector 1
8, the positions of both sides of the rolled material S in the width direction are detected continuously over time, and the signal (1) is sent to the calculation device 20 to determine the off-center amount X of the rolled material S with respect to the center e of the rolling line.
is calculated, and the command signal (3) corresponding to the sign and magnitude of the off-center amount X is output from the calculation device 20, and each position control device 21a, 21 . b, 22a, 22b, and in the vertical rolling mill 6.8, actuators lOa,
1Ob11a and llb operate, and the vertical rolls 7a, 7b,
9a, 9b or gap G+ in response to command signal ■3
, G2 are maintained at a constant interval, and the rolled material S is shifted in the width direction. For example, as shown in FIG. 1, when the off-center amount X occurs to the left in the rolling line direction D1 with respect to the rolling line center e, the vertical rolls 7a, 7b, 9a, 9b are moved in the rolling line direction D1. Move to the left by X amount and vertical roll 7a.

Align the center between 7b, 9a, and 9b with the center of the rolled material S,
Set the off-center amount to zero.

Therefore, the tip corners of the rolled material S bitten between the vertical rolls 7a and 7b of the vertical rolling mill 6 are the left and right vertical rolls 7a,
7b, and is introduced between the vertical rolls 7a and 7b with the inclination angle θ shown in FIG. 8(b) being zero, and is rolled down in width. Therefore, the rolled material S is sent straight in the rolling line direction D1 without being tilted, and the leading end of the rolled material S is only laterally curved and the resulting camber or nose curve is not generated.

When the tip of the rolling mill S whose width has been reduced by the vertical rolling mill 6 is sent in the rolling line direction D1 and passes through the center of the vertical guide rollers 16a and feb disposed on the side guides 12a and 12b, When the tip of the rolled material S is detected by the means, the actuators 3 and 14a and 14b are activated, and the vertical shape is moved to the idler roller le.
a and 18b are pressed against both sides of the rolled material S in the width direction with a constant pressure. As a result, the rolled material S whose midway part has been introduced into the vertical rolling mill 6 moves forward without being inclined with respect to the center e of the rolling line, and is bitten between the work rolls 2 and 3 of the rough horizontal rolling mill i. The rolled material S is horizontally rolled, but the rolled material S is placed in the rough horizontal rolling mill l.
Since there is no lateral bending at the tip of the rolled material S when it is introduced, no nose bending occurs in the rolling mill s due to rough horizontal rolling.

The tip of the rolled material S sent out from the rough horizontal rolling mill l is sent in the rolling line direction D1 and passed through the side guides 13a, 13.
When the roller passes through the center of the vertical guide rollers 17a and 17b disposed at b, the actuators 15a and 15b are actuated to press the vertical guide rollers 17a and 17b against both sides of the rolling +43 in the width direction with a constant pressure. Therefore, the middle part of the rolled material S introduced into the vertical rolling mill 6 and the rough horizontal rolling mill 1 is
are vertical guide rollers lea, IEib, 17a, 17
It is fed straight without tilting while being guided by the rollers b, is bitten by the vertical rolls 9a and 9b of the vertical rolling mill 8, and is rolled down in width after rough horizontal rolling. Since the tip of the rolled material S has no camber or nose bend, the rolled material S is smoothly bitten between the vertical rolls 9a and 9b of the vertical rolling mill 1 without any support.

Further, the rolled material S is introduced into both of the vertical rolling mills 6.8, so that the rolled material S is rolled by the vertical rolls 7a, 7b of the vertical rolling mills 6, 8,
9a, 9b and the work rolls 2.3 of the rough horizontal rolling mill 1 (the circumferential speed of the work rolls 2.3 or the vertical rolls 7a, 7
b, and the circumferential speed of the vertical rolls 9a9b is higher than the circumferential speed of the work rolls 2 and 3), the rolled material S
Since a so-called front tension (-1) is added to the width, a larger width reduction can be performed compared to the case without front tension.In other words, the strip width at the entrance side of the vertical rolling mill 6 is set as Wl, If the strip width at the exit side of the die rolling mill 8 is W2, then Wl/W2 becomes large.

The graph in Figure 3 shows the relationship between the plate width ratio and the width reduction ratio,
The solid line 1 indicates the case where width reduction is not performed after rough horizontal rolling as in the conventional method, and the solid line ■ indicates the case where width reduction is performed with forward tension applied even after rough horizontal rolling as in Example 5. show. From this graph, it can be seen that for the same plate width ratio (-plate width/plate thickness), the width reduction ratio is greater when width reduction is performed with forward tension applied after rough horizontal rolling as in this example. If a large width reduction ratio can be obtained during width reduction of the rolled material S in this way, it is possible to improve production efficiency during production of the strip.

The rear end of the rolled material S is the vertical rolls 9a and 9b of the vertical rolling mill 8.
Once the material has come out of the gap, move the rolled material S in the rolling line direction D1.
In this case, the position of the vertical rolling mill 8.6 is controlled based on the signal v2 detected by the lateral deviation detector 19. v
This is done in substantially the same way as in step 1.

FIG. 4 and FIG. 5 show another embodiment of the present invention, which differs from the previous embodiment in that the vertical rolls 7a of the vertical rolling mills 6 and 8,
7b, 9a, and 9b can be moved in a direction parallel to the rolling line direction D1. 23a and 23b in the figure
, 24a, 24b are 6 of the vertical rolling mills 6, 8, and the vertical rolls 7a, 7b, 9a, 9b are moved in the rolling line direction D1.
The actuator, such as a hydraulic cylinder, is used to shift in a direction parallel to the image plane, and the same elements as those shown in FIG. 1 are given the same reference numerals.

For example, if the rolled material S being sent in the rolling line direction D1 is off-centered by an amount X to the left in the rolling line direction D1 with respect to the rolling line center e, the vertical rolling The vertical roll 7a of the machine 6 is offset in the rolling line direction D1, and the vertical roll 7b is offset in the opposite direction D2 to the rolling line direction D1, and the vertical rolls 7a and 7b are connected at their centers as shown in FIG. The line is tilted by θ with respect to the line formed by connecting the centers of the vertical rolls 7a and 7b before being offset. As a result, the tip of the rolled material S is moved to the vertical roll 7 as shown by the two-dot chain line in FIG. 5, for example.
Regarding a, the left corner of the tip of the rolled material S is connected to the vertical roll 7.
It is tilted by the angle of inclination θ when viewed from above because it is tilted by 9 by a, but
As mentioned above, since the line formed by connecting the centers of the vertical rolls 7a and 7b is also inclined by θ, the rolled material is The tip of S is caught between the vertical rolls 7a and 7b,
Since the tip of the rolled material S is reduced in width by the same amount on the left and right sides,
No lateral bending occurs at the tip of the rolled material S.

Further, when the rolled material S is sent while being reduced in width and the tip reaches the vertical guide rollers 1ea and lcb, the vertical rolls 7a and 7b are returned to their original positions and the centers of the vertical rolls 7a and 7b are tied together. The slope θ of the line formed by is set to zero. As a result, the inclination angle θ of the rolled material S also becomes zero, so that the rolled material S is fed straight thereafter. Therefore, the rolled material S is also smoothly bitten by the vertical rolling mill 8, and width reduction is performed by the vertical rolling mills 6 and 8 while applying forward tension to the rolled material S.

To adjust the off-center when width reduction is performed while the rolled material S is sent in the opposite direction D2 to the rolling line direction D1, the actuators 24a and 24b move the vertical rolls 9a and 9b appropriately in a direction parallel to the rolling line direction D1. This is done by shifting.

In addition, in the embodiments of the present invention, the case where the rolled material is rehabilitated has been described, but if a material with a predetermined width and thickness is obtained in one pass, it can be carried out without reversing. It goes without saying that various other changes may be made without departing from the gist of the present invention.

[Effects of the Invention] According to the rolling method and its device of the present invention, horizontal bending such as camber or nose bending does not occur at the tip of the rolling mill, so that the rolled material is transferred to the vertical rolling mill upstream of the horizontal rolling mill. only,
Width rolling can also be performed by the vertical rolling mill downstream of the horizontal rolling mill, making it possible to perform vertical rolling → horizontal rolling - vertical rolling in one pass, thus improving the width rolling ratio and increasing production efficiency. It can produce excellent effects.

[Brief explanation of drawings]

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a graph showing plate width ratio and width reduction ratio, and FIG. 4 is another embodiment of the present invention. A plan view of the example, Fig. 5 is a principle diagram for correcting the off-center of the rolled material when performing width reduction and rough horizontal rolling by the means shown in Fig. 4, and Fig. 6 is a diagram of the principle of correcting the offset of the rolled material when performing width reduction and rough horizontal rolling by the means shown in Fig. 4. and a plan view of the conventional equipment for rough horizontal rolling, Fig. 7 (
A) is a plan view of the camber that occurs in the rolled material when width reduction is carried out by the conventional means, and FIG. , FIGS. 8(a), 8(b), and 8(c) are diagrams showing the principle behind the occurrence of camber and nose bending. In the figure, 1 is a rough horizontal rolling mill (horizontal rolling mill), 2.3 is a work roll, 6 and 8 are vertical rolling mills, 7a, 7b, 92°9b
indicates a vertical roll, S indicates a rolled material, and Dl indicates the rolling line direction.

Claims (1)

[Scope of Claims] 1) By applying tension to the rolled material due to the peripheral speed difference between the vertical rolling mill vertical rolls and the horizontal rolling mill work rolls disposed upstream and downstream in the rolling line direction of the horizontal rolling mill, A rolling method characterized in that the rolled material is width-reduced and horizontally rolled. 2) The rolled material is reduced in width by applying tension to the rolled material due to the circumferential speed difference between the vertical rolling mill vertical rolls and the horizontal rolling mill work rolls disposed upstream and downstream in the rolling line direction of the horizontal rolling mill. At the same time, during horizontal rolling, the center between the vertical rolls of the vertical rolling mill is aligned with the center of the rolled material in the width direction while keeping the left and right distance between the vertical rolls constant. 3) The rolled material is reduced in width by applying tension to the rolled material due to the circumferential speed difference between the vertical rolling mill vertical rolls disposed upstream and downstream in the rolling line direction of the horizontal rolling mill and the horizontal rolling mill work rolls. A rolling method characterized in that the vertical rolling mill vertical rolls are moved in the rolling line direction during horizontal rolling. 4) A horizontal rolling mill equipped with work rolls, and a vertical rolling mill equipped with vertical rolls that are disposed upstream and downstream of the horizontal rolling mill in the rolling line direction and that can be shifted in the width direction of the rolled material while maintaining the same interval. A rolling device characterized by being equipped with a die rolling mill. 5) A vertical rolling mill equipped with a horizontal rolling mill equipped with work rolls and a vertical rolling mill disposed upstream and downstream of the horizontal rolling mill in the rolling line direction and capable of shifting in a direction parallel to the rolling line direction. A rolling device characterized by: