JPS6355365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-high rolling mill equipped with a mechanism for controlling the shape of rolled material.

In recent years, various methods of bending work rolls in four-high rolling mills have been developed and implemented in order to control the thickness profile of rolled materials in the width direction.
Conventional roll bending methods have had limitations in their ability to control the shape of rolled materials.

In other words, in order to obtain a rolled product with a good shape and little change in thickness, especially in the thickness direction, deformation of the work rolls due to rolling loads, etc. should be minimized, and the correction ability by roll bending should be increased. This is very important.

Conventional four-high rolling mills only have a vertical roll bending device, so the amount of crown correction of the roll is small and only a simple parabolic shape is corrected. The shape of the inside was able to be corrected. Furthermore, the effect was small on narrow plates of less than 1/2 of the roll axis length, and a good shape correction effect could not be obtained.

Therefore, in order to eliminate the above-mentioned drawbacks, one of the upper and lower work rolls is made smaller in diameter than the other, the small-diameter work roll is offset in the rolling direction with respect to the other work roll, and the small-diameter work roll is A multi-high rolling mill has been proposed in which horizontal bending is applied by split rolls via a presser roll parallel to the work roll, and this horizontal bending corrects the roll crown in the vertical direction of the work roll. Since it is a roll, if you press the presser roll with a split roll,
Because the presser roll was used, the locally applied force was dispersed, and sensitive partial pressure was not transmitted to the work roll.

The present invention was made for the purpose of improving the shape control function by greatly and arbitrarily changing the roll crown in the vertical direction of the work roll. The diameter of the work roll is smaller than that of the roll, and the work roll of the small diameter is offset in the rolling direction from the other work roll, and on the offset side of the work roll of the small diameter, a presser roll, a split roll, and a horizontal bending roll are placed parallel to the work roll of the small diameter. The rolling mill equipped with the device is characterized in that a convex crown is provided on the outer periphery of the portion of the presser roll that contacts the divided rolls.

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

An upper work roll 3 is disposed below the upper back up roll 1, and an intermediate roll 4 is disposed above the lower back up roll 2.
A lower work roll 5 having a smaller diameter than the upper work roll 3 is disposed between the upper work roll 3 and the intermediate roll 4, and the lower work roll 5 is offset from the upper work roll 3 in the rolling direction.

A casing 7 is attached to the inner surface of the housing 6 of the rolling mill.
and fix the piston rod 8 to the casing 7.
_-1 , 8 _-2 ... 8 _-7 Fluid pressure cylinders 9 _-1 , 9 _-2 ... 9 _-7 that can move forward and backward in the rolling mill line direction
Piston rods _8-1 , _8-2 ...
Support plates 10 _-1 , 10 _-2 , . . . 10 _-7 are arranged so as to be able to slide in the direction of the lower work roll 5 by means of 8 _-7 . Support plate 10 _-1 , 10 _-2 ...1
The number of sets of 0 _-7 and the number of sets of fluid pressure cylinders 9 _-1 , 9 _-2 ...9 _-7 are the same, and each support plate 10 _-1 , 1
0 _-2 ...10 _-7 are corresponding fluid pressure cylinders 9
_-1 , 9 _-2 ...9 _-7 allows sliding.

A sideways U with an open surface facing the lower work roll 5 at the tip of the support plate 10 _-1 , 10 _-2 ...10 _-7
A shaft 11 parallel to the lower work roll 5 is inserted into the groove, and the shaft 11 can be supported by the groove edge, and the support plates 1 on both sides are provided.
0 _-1 , 10 _-7 , fluid pressure cylinders 12a, 12b
a clamp 13a for gripping the shaft 11, which is opened and closed by
13b, and each support plate 10 _-1 , 10 _-2
...10 _-7 , split rolls 14 _-1 , 14 _-2 ...14 _-6 are rotatably pivoted to the shaft 11.

Lower work roll 5 and divided rolls 14 _-1 , 14 _-2
... _14-6 , insert the insert roll 15 whose center is located on the straight line l connecting the center of the lower work roll 5 and the center of the divided rolls _14-1 , _14-2 ... _14-6 . The piston rods 8 _-1 , 8 _-2 , .
A shaft box 16 is attached to guide the shaft box 16 so that it can move in the same direction as _{8-7 ,} and _{a second}
As shown in the figure, each divided roll is provided with a convex crown so that the diameter is large near the center in the width direction and the diameter becomes small as it deviates from the center.

In the figure, _17-1 , _17-2 ... _17-7 are sensors that detect the amount of movement of the piston rods _8-1 , _8-2 ... _8-7 .

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

During rolling, the lower work roll 5 is offset in the rolling direction, and the hydraulic cylinders 9 _-1 , 9 _-2 . . .
Supply pressure oil to _9-7 and connect piston rods _8-1 and _8-2.
...8 _-7 are individually protruded by a desired amount, and support plates 10 _-1 , 10 _-2 ...10 _-7 are moved by a desired amount, and the support plates 10 _-1 , 10 _-2 ...10 _-7 are divided. The rolls 14 _-1 , 14 _-2 . . . 14 _-6 are each pressed against the presser roll 15 with arbitrary strength to give the presser roll 15 a desired horizontal bend.

When the desired horizontal bending is applied to the presser roll 15,
The lower work roll 5 is displaced in the horizontal direction and also in the vertical direction to change the roll crown, so that the shape of the rolled material S can be freely controlled according to the displacement position and displacement amount. This shape control function becomes even better when a work roll bending device is also used.

In the embodiments of the present invention, a case has been described in which the shaft of the split roll is inserted into a horizontal U-shaped groove provided in the support plate and clamped on both sides. It is also possible to implement this by providing a shaft and inserting the shaft through the round hole; the roll that is offset and pushed by the presser roll may also be used as the upper work roll; and the actuator that presses the presser roll may be a wedge or screw instead of a fluid pressure cylinder. It is also possible to make various changes without departing from the gist of the present invention.
Of course, etc.

According to the multi-high rolling mill having a shape control function of the present invention, since the presser roll is provided with a convex crown corresponding to the split roll, displacement due to horizontal bending can be effectively imparted to the work roll. The vertical displacement amount and deflection curve of the work roll can be set largely and freely, and as a result, the shape control function becomes even better than before.

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of a multi-high rolling mill having a shape control function according to the present invention, FIG. 2 is a plan view of the shape control mechanism of the rolling mill shown in FIG. 1, and FIG.
4 is a view taken in the - direction of FIG. 2. In the figure, 3 is the upper work roll, 5 is the lower work roll, 8 _-1 , 8 _-2 ... 8 _-7 is the piston rod, 9 _-1 ,
9 _-2 ...9 _-7 is a fluid pressure cylinder, 10 _-1 , 10 _-2 ...
10 _-7 is a support plate, 14 _-1 , 14 _-2 ...14 _-6
15 indicates a divided roll, and 15 indicates a presser roll.

Claims (1)

[Claims] 1 One work roll of the upper and lower low crawl rolls is made smaller in diameter than the other work roll, the small diameter work roll is offset in the rolling direction with respect to the other work roll, and the small diameter work roll is placed on the offset side of the small diameter work roll. A rolling mill in which a presser roll, a split roll, and a horizontal bending device are arranged in parallel with a small-diameter work roll, and a shape control function characterized by providing a convex crown on the outer periphery of the portion of the presser roll that contacts the split rolls. A multi-high rolling mill with