JPH0259104A - Twenty-high rolling mill - Google Patents

Abstract

PURPOSE:To reduce a shift amount of 1st intermediate rolls and to quicken responsiveness of shape control by forming an end of at least one pair of 2nd upper and lower intermediate rolls in a 20-high rolling mill into a tapered shape and installing a shift and a bending devices. CONSTITUTION:Tapered shape rolls are used for 2nd intermediate rolls 4 as well as 1st intermediate rolls 3. The rolls 3 and 4 are shifted in the axial direction and a bending force is acted on the rolls 4 to roll a rolled stock 1. Hence, a shift amount of the rolls 3 is reduced and shape control having quick responsiveness is performable.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a 20-high rolling mill having excellent flatness control function.

<Conventional technology> In conventional 20-high rolling mills, the work roll has a small diameter, so the deflection pattern of the work roll is complicated, and the shape of the taper of the first intermediate roll is selected depending on the width and material of the rolled material. , determine the position of the first intermediate roll according to the plate thickness, and further,
In order to follow changes in flatness due to changes in the thermal crown of the work roll that occur during rolling, the first intermediate roll is shifted in the axial direction, and the backup roll is divided into multiple parts in the width direction to adjust the displacement of each individual roll. By adjusting the amount, the shape of the rolled material is controlled.

However, the above method is based on the UC method that can efficiently utilize bending force as shown in Japanese Patent Application Laid-Open No. 180602/1982.
Compared to a six-high rolling mill such as a mill, the controllability of flatness was poor and the responsiveness was also poor.

As a countermeasure to this problem, Japanese Patent Application Laid-Open No. 62-45413 discloses 2
A shape control method has been proposed in which one end of the first intermediate roll of a zero-high rolling mill is formed into a tapered shape, and a horizontal bending force is applied to one end of the first intermediate roll to adjust the amount of vertical deflection. However, this method has not been realized yet because the flatness control is limited by shifting and bending the first intermediate roll alone, and the equipment is complicated.

<Problems to be Solved by the Invention> As described above, in the conventional technology, there is a problem in that the tapered shape of the first intermediate roll must be optimized depending on the type of rolled material. In addition, flatness adjustment during rolling relies on the axial shift of the first intermediate roll or the displacement of the backup roll, but the first intermediate roll needs to move a fairly long distance, and If you shift the roll, there is a risk of scratching the roll. Also,
Adjustment of the displacement amount of the backup roll also has a problem in that the displacement amount is transmitted to the work roll via the first intermediate roll and the second intermediate roll, so that the effectiveness is reduced and only a local effect can be expected.

The present invention aims to overcome these problems and provide a 20-high rolling mill with excellent flatness control ability.

<Means for Solving the Problems> In the present invention, two small-diameter work rolls are arranged symmetrically across a pass line, and two first intermediate rolls and three first intermediate rolls are arranged behind the small-diameter work rolls, respectively. second intermediate roll, 4
book backup rolls are sequentially placed in contact with each other, the end of the first intermediate roll is tapered, and the first intermediate roll is tapered;
In a 20-high rolling mill in which the intermediate roll is shiftable in the axial direction, at least one set of upper and lower ends of the second intermediate roll is formed into a tapered shape, and the second intermediate roll is shiftable in the axial direction. A bending device that applies bending force to the shift device and the second intermediate roll is provided.

<Function> Use tapered rolls as shown in Fig. 3.4 as the 1.2 intermediate rolls, position the 1.2 intermediate rolls as shown in 5th [F(a), and When rolling the plate into an edge build-up shape by applying bending force to the intermediate roll, and when rolling the plate into an edge build-up shape, position the 1.2 intermediate roll and the second intermediate roll as shown in Fig. 5(b). By applying bending force, the flatness of the plate was rolled to the extremes of rolling into an edge drop shape. An example thereof is shown in FIG. In Figure 6, graph (a)
, (b) correspond to the cases shown in FIGS. 5(a) and 5(b), respectively, and the range between graphs (a) and (b) is the range in which out-of-control is possible.

This range is in particular the control range according to the prior art (No. 8.10
(see figure), it also covers the head loading of the base edge build-up, so there is no need to change the taper shape of the first intermediate roll depending on the plate width, steel type, and thickness of the rolled material unlike in the prior art.

In addition, by using the 1.2 intermediate roll shift and the 2nd intermediate roll bending together, the moving distance of the first intermediate roll can be reduced, so the responsiveness of the flatness control of the rolled material can be improved compared to the conventional technology. It can be made significantly faster.

<Example> An embodiment of the present invention will be described based on the drawings.

FIG. 1.2 is a diagram showing the roll arrangement of an embodiment of the 20-high rolling mill of the present invention, and shows the roll arrangement of the 1st rf! J is a side view, and FIG. 2 is a front view.

In the figure, a pair of work rolls 2 are arranged above and below with a rolled material l in between, and a total of four first intermediate rolls 3, two on each work roll 2, are placed behind the work rolls 2.
is placed in contact with.

Behind the first intermediate roll 3, a total of six second intermediate rolls 4, three each on the upper and lower sides, are installed.
Behind the back, there are eight back-up rolls 5 installed, four each on the top and bottom. Note that the backup roll 5 is directly supported by the housing 8.

Among these, mutually opposite ends of the upper and lower first intermediate rolls 3 are provided with tapered portions formed in a tapered shape, and the first intermediate rolls 3 have a structure that can be shifted in the axial direction.

In addition, at least one set of upper and lower second intermediate rolls 4 is tapered at the end opposite to the tapered part of the first intermediate roll 3 that is in contact with it, and is provided with a second intermediate roll chock 6.
, the bending force is applied by the cylinder 7. Furthermore, the second intermediate roll 4 has a structure that can be shifted in the axial direction. Note that the shift device may be of a hydraulic type or an electric type.

In this way, by making not only the first intermediate roll 3 but also the second intermediate roll 4 tapered, shifting them in the axial direction, and adding a bending device, it is possible to control the flatness over a wide range with faster response than before. jI1 effect can be obtained.

Next, a specific example will be described in comparison with the conventional technology.

First, in the case of the present invention, a tapered roll as shown in FIG. 3 was used as the first intermediate roll, and a tapered roll as shown in FIG. 4 was used as the second intermediate roll. and,
By shifting the first intermediate roll and the second intermediate roll in the axial direction and applying a bending force to the second intermediate roll, the SUS material with a width of 1000n++a is turned into a sheet with a thickness of 1.2m.
It was rolled from a+ to 1.0-.

At this time, when rolling the temporary flatness into an edge build-up shape by positioning the first and second intermediate rolls and applying a bending force to the second intermediate rolls as shown in FIG. 5(a), As shown in Fig. 5(b), by positioning the first and second intermediate rolls and applying a bending force to the second intermediate roll, the flatness of the plate is rolled at both extremes to form an edge drop shape. The results are shown in graphs (a) and (6) of FIG. 6, respectively.

Next, as a conventional method (1), a tapered first intermediate roll as shown in FIG.
A SUS material with a thickness of 1.2 mm was rolled from a thickness of 1.2 mm to a thickness of 1.0 m.

At this time, when the flatness of the plate is rolled into an edge build-up shape by positioning the first intermediate roll as shown in Fig. 7 (al), and as shown in Fig. 7 (b), the first intermediate roll When rolling the flatness of the plate into an edge drop shape, perform rolling at both extremes, and compare the results with the 8th
This is shown in graphs (a) and (b) of the figure.

Furthermore, as a conventional method (2), a tapered four-dog first intermediate roll as shown in Fig. 3 is used, only the first intermediate roll is shifted in the axial direction, and a bending force is applied to the first intermediate roll. , similar to the present invention and the conventional method (]),
A SUS material with a plate width of 1000 m was rolled from a plate thickness of 1.2111 flll to 1.0 m1 m.

At this time, as shown in FIG. 9(a), when the first intermediate roll is positioned and a bending force is applied to the first intermediate roll, the flatness of the plate is rolled into an edge build-up shape; As shown in Figure 9 (b), the first intermediate roll is positioned and a bending force is applied to the first intermediate roll to perform rolling at both extremes when rolling the plate into an edge drop shape. The results are shown in graphs (a) and (b) of FIG. 10, respectively.

In Figure 6.8.10, the shaded range between graphs (a) and (b) is the respective controllable range.

As can be seen from these figures, in the conventional methods (1) and (2), the control range is narrow and the plate shape tends to edge drop. In conventional methods (1) and (2), because of the narrow control range, it is necessary to change the taper shape of the first intermediate roll depending on the plate width, steel type, and thickness of the rolled material. The moving distance of the roll is long (and its response is extremely slow. However, according to the present invention, even if the intermediate roll taper is constant, first and second intermediate roll shifting and second intermediate roll bending are used together. By doing so, it becomes possible to quickly obtain a good roughness with excellent flatness and responsiveness for various types of rolled materials.

<Effects of the Invention> As explained above, with the 20-high rolling mill of the present invention, the shift meter of the first intermediate roll can be reduced compared to the conventional one, and the taper shape of the first intermediate roll can be adjusted according to the strip width, steel type, etc. This enables good shape control with fast response without changing the shape.

[Brief explanation of the drawing]

1.2 is a roll arrangement diagram of an embodiment of the 20-high rolling mill of the present invention, FIG. 1 is a side view, and FIG. 2 is a front view. FIG. 3.4 is a side view showing the shape of the 1.2 intermediate roll in one embodiment of the present invention. FIG. 5 is a side view showing the position of the 1.2 intermediate roll and the state of action of the bending force when controlling the flatness of both extremes of edge build-up and edge drop using the 20-high rolling mill of the present invention; The figure is a graph showing an example of rolling with the roll arrangement and bending force acting state shown in FIG. 5. Figure 7 is a side view showing the position of the first intermediate roll when edge build-up and flatness control at both extremes of the encitrotube are performed using the conventional method (1), and Figure 8 is a side view showing the position of the first intermediate roll when edge build-up and flatness control at both extremes of the encitrotube are performed using the conventional method (1). It is a graph which shows an example of a case. FIG. 9 is a side view showing the position of the first intermediate roll and the state of action of the bending force when controlling the flatness at both extremes of edge build-up and edge drop using the conventional method (2), and FIG. It is a graph which shows an example of the case of rolling with the roll arrangement and the action state of bending force shown in the figure. 3...First intermediate roll, 4...Second intermediate roll,
5... Backup roll, 6... Chillack for second intermediate roll, 7... Cylinder, 8... Housing.

Claims (1)

[Claims] Two small-diameter work rolls are arranged symmetrically across a pass line, and two first intermediate rolls, three second intermediate rolls, and four backup rolls are sequentially contacted behind each of the small-diameter work rolls. In the 20-high rolling mill, the end portion of the first intermediate roll is formed into a tapered shape, and the first intermediate roll is shiftable in the axial direction, at least one set of upper and lower second intermediate rolls. The 20-stage roller has an end portion tapered, and is provided with a shift device that allows the second intermediate roll to shift in the axial direction and a bending device that applies a bending force to the second intermediate roll. rolling machine.