JPS6293016A - Adjusting device for plate shape of rolling stock - Google Patents

Abstract

PURPOSE:To control the plate thickness in the width direction and shape of a steel plate by arranging the deforming roll having different diameters in the roll axial direction relatively to the upper and lower at the inlet side or outlet side of a rolling mill and by passing the steel plate with mutually moving the roll in the axial direction. CONSTITUTION:The plate thickness in the width direction of a steel plate is uniformized by passing it through a tension control device 1 and the defects of a lug waviness, mid elongation, etc. in the plate shape are straightened in case of rolling the steel plate by a rolling mill 2 by arranging the tension control device 1 at the inlet side (or outlet side) of a cold rolling mill 2. The roll 4, 5 that the diameter varies in the axial direction is arranged to the upper and lower in the tension control device 1 and the steel plate is passed therebetween. The roll 4, 5 are made movable in the axial direction and by passing the steel plate through the space therebetween by changing the mutual position of both rolls 4, 5 the thickness in the width direction of the steel plate and shape are controlled by varying the tension distribution in the width direction of the steel plate and the steel plate having no defective shape of a lug waviness, etc., with uniform thickness in the width direction is produced.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an apparatus for rolling a plate-shaped rolled material using a rolling mill having at least two rolls and adjusting the shape of the plate. It is related.

(Prior Art) Product precision in skin pass rolling or cold rolling is becoming increasingly strict. Among them, the longitudinal plate thickness accuracy has reached a level that is sufficiently satisfactory for practical use due to automatic plate thickness control using a hydraulic rolling device or a hydraulic reduction device in the cold rolling process.

However, although various rolling mills and rolling methods have been proposed for the accuracy of sheet thickness in the width direction and the resulting shape of the sheet, such as ear waves and mid-elongation, it is still at the development stage, and its effects are still unknown. At present, these methods are limited and each has its own disadvantages.

For example, in recent years, as a rolling mill with high performance in controlling thickness in the width direction,
6-high rolling mill (JP-A-47-29260), cross-roll rolling mill (JP-A-56-131005),
Variable crown roll rolling mill (JP-A-59-15350
Publication No.).

While conventional 4-high rolling mills use roll bending and roll crown to control the thickness in the width direction, 6-high rolling mills use a new shiftable intermediate between work rolls and backup rolls. By providing rolls and changing the stepped portion of the intermediate roll depending on the width of the rolled material, it is attempted to obtain higher accuracy in the thickness of the material in the width direction.

In addition, in a cross-roll rolling mill, the upper work roll and lower work roll are arranged so that their axes are twisted,
The idea is to control the plate crown by utilizing the fact that the equivalent roll gap changes depending on the size of the helix angle. A variable crown roll type rolling mill applies high hydraulic pressure between the arm of the backup roll and the sleeve to change the amount of expansion of the sleeve and control the thickness in the width direction.

All of these rolling mills are based on the principle of mechanically adjusting the rigidity in the machine direction between the roll bites and the profile at the roll bite. For this reason, the mill body, which is required to be as simple as possible for roll changes and maintenance, is extremely complex compared to conventional four-high rolling mills.

In other words, a six-high rolling mill has two more rolls, which worsens the roll consumption rate, requires a large shop space, and requires equipment for rolling intermediate rolls on both the upper and lower sides. As a result, the rolling mill becomes complicated and difficult to maintain. In addition, in a cross-roll rolling mill, only the work roll, or a pair of work roll and backup roll, must be tilted with respect to the line direction9, and when such loss roll rolling is performed, a large thrust force is generated. This requires a large and complex roll tilting device.

Does a variable roll crown type rolling mill use high-pressure liquid on the rotating backup roll? Since it is necessary to feed the mill, it is necessary to install a new high-pressure hydraulic device and to attach a durable rotary jointer to the mill body.

As described above, these rolling mills are designed to improve the precision control of plate thickness in the machine direction, while offering the simplicity and ease of maintenance of the rolling mill itself. Furthermore, as rolling mills have become more complex and precise, the cost of rolling mills has also become more expensive than conventional rolling mills.

(Problems to be Solved by the Invention) The present invention has a large shape adjustment ability even in conventional 4-high rolling mills or 2-high rolling mills, without making the rolling mill body complicated, and has a 6-high rolling mill. It is an object of the present invention to provide a rolling device that can add even greater shape adjustment ability when combined with a rolling mill such as a rolling mill that has a high shape adjustment ability.

(Means for Solving the Problems) The present invention provides at least two rolls having different diameters in the roll body length direction on the entry side and/or exit side of a rolling mill, which are shifted by a predetermined distance in the direction in which the rolled material passes. This is an apparatus for adjusting the shape of a rolled material plate, characterized in that the upper and lower rolls are arranged so as to be relatively movable in the axial direction, and the tension distribution in the width direction of the rolled material can be changed.

(Function) The present invention provides at least one or more sets of upper and lower rollers with non-uniform diameters in the axial direction on the front or rear surface of a rolling mill or on both sides of the rolling mill. The upper and lower rollers are arranged alternately at a certain interval in the passing direction, and the upper and lower rollers are moved relative to each other in the axial direction according to the rolling conditions to change the length of the board path through which the rolled material passes in the width direction. The purpose is to adjust the shape of the plate after rolling by changing the tension in the width direction of the material.

(Example) In Fig. 1, 1 is a front tension control device, 2 is a rolling machine,
6 is a deflector-Vinch roll, and when the present invention is applied between the rolling mills of a tandem rolling mill, another rolling mill is arranged at the position of the deflector-Vinch roll 3. Reference numeral 4 constitutes a front tension control device. Upper roll 5 is a lower roll, and these rolls are disposed so as to be movable in the axial direction by a cylinder 6, as shown in FIG. 2, for example.

The upper roll 4 and lower roll 5 each have an outer diameter profile as shown in FIG. 2, for example, and are arranged so that the outer diameter profiles of the upper roll 4 and the lower roll 5 are approximately symmetrical. There is.

When the positions of the upper and lower rolls are in the state shown in Figure 2 (al), the axial movement of the upper and lower rolls is 0, and the length of the board path of the material passing between the upper and lower rolls is 0 in the width direction. Therefore, the tension distribution in the width direction is constant, and the influence of tension on the rolling phenomenon is also constant in the width direction.

Here, as shown in FIG. 2(b), when the upper roll is moved to the left and the lower roll to the right in the axial direction, the length of the board path of the material passing between the upper and lower rolls changes in the width direction. That is, in FIG. 2(b), the plate material passing through the cross section AA does not pass through the large diameter portion of both the upper and lower rolls, and the plate material passes through the board path 8 shown in FIG. 3.

On the other hand, the plate material passing through the cross section BB between FIGS. 2 and 3 does not pass through the portion where both the upper and lower rolls have a smaller diameter, and the plate material passes through the board path 7 shown in FIG. 3. If the axial movement of the upper and lower rolls is symmetrical with respect to the center of the sheet width, then Figure 2 (
In the bl state, the board road is long at the center of the board, and the board road is short at both ends of the board. Therefore, the tension distribution in the width direction is higher at the center of the plate than at both ends.

On the other hand, if you move the upper roll to the right and the lower roll to the left as shown in Figure 2 [tel], contrary to the case in Figure 2 [b],
If the board road is short at the center of the board and long at both ends of the board, the tension distribution in the width direction will be higher at both ends than at the center. The tension distribution difference in the width direction can be changed by the amount of movement of the upper and lower rolls, depending on the desired plate shape.
It is possible to give a tension difference arbitrarily.

Here, an example of calculating changes in the boardwalk in the width direction according to the present invention will be described. Figure 4 shows the following roll diameters and their positions used in the calculation. In the figure, 11 = 400 m
m%12: 300 mm%IM=$20 rrLr
n.

d = 1O-6x' -2x +300 (x is the coordinate in the axial direction with the origin at the center of the roll pan.) Figure 5 shows a board width of 1000 mm and a roll of t50tnfn.
Shows the difference in the boardwalk when moved. (a) shows the roll profile, (bl is based on the board road at the end of the board,
This is the difference in the board path in the board width direction expressed as a percentage.

Similarly, Figure 6 shows a plate width of 500 mm and a roll of 50 fn.
It shows the difference in boardwalk when moving fn.

As is clear from Figures 5 and 6, in this calculation example, by simply moving the roll k 50 mm, the difference in the boardwalk is 1%.
It turns out that there is more to it than that. Generally, it is said that the difference in plank track has a large effect on tension, so if the present invention is applied to an actual machine, it is possible to make the roll profile more nearly flat and to reduce the amount of roll movement. It is. Further, according to the present invention, it is possible to have a large shape control capability even for narrow width materials, for which the control range was small using conventional methods.

(Effects of the Invention) According to the present invention, it is possible to change the width direction tension distribution of the rolled material at the entrance side and the exit side of the rolling mill, and it is possible to control the plate shape of the rolled material.

By using the method according to the present invention, (1) it is possible to obtain a large shape control effect even for narrow width materials without using a rolling mill with complicated equipment and mechanisms, difficult to maintain, and extremely expensive equipment; can.

(2) Since the shape control device according to the present invention is not installed directly on a rolling mill, it can be easily installed in an extremely large rolling mill without modifying an existing 4-high rolling mill or a 2-high rolling mill used for dull rolling, etc. It brings great technical and economic benefits, such as the ability to control the shape.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is an explanatory diagram of the state when the upper and lower rolls are moved, Fig. 3 is an explanatory diagram of the change in slope depending on the roll diameter, and Fig. 4 is an explanatory diagram of the state when the upper and lower rolls are moved. Explanatory diagram of the model for calculating the effects of the invention, No. 5. FIG. 6 is a diagram of the calculation results of the present invention. 1: Tension control device 2): Rolling mill 3: Deflector roll 4: Upper roll 5: Lower roll 6:
Cylinder 72 Board road when passing through a part with a small roll diameter 8: Board road when passing through a part with a large roll diameter Patent attorney Tatsuo Chanoki Figure 2 (cl) (b) (C )

Claims (1)

[Claims] At least two rolls having different diameters in the roll body length direction are arranged on the entry side and/or exit side of the rolling mill at a predetermined distance in the direction in which the rolled material passes, and the upper and lower rolls are moved relative to each other in the axial direction. A device for adjusting the shape of a rolled material plate, characterized in that it is freely disposed and can change the tension distribution in the width direction of the rolled material.