JPS60238021A - Rolling mill - Google Patents

Abstract

PURPOSE:To produce a rolling material of good quality by fitting a proper crown to the body end part of a shiftable work roll, by shifting the work roll according to the variation in detecting rolling forces and by performing a correct compensation always at the width end part of the rolling material even in case of the variation in rolling forces. CONSTITUTION:A crown 5 having a proper shape is fitted to the body end parts of shiftable work rolls 3, 4. Servo valves 8, 9 are operated with a proportional controlling device 11 according to the variation in a detected rolling force 10 and shifting cylinders 6, 7 are operated in reverse direction each other and the work rolls 3, 4 are shifted. The rolling force 10 is made correct just sufficiently with the change in the thickness of the width end part of the rolling material S by the position of the crown part 5. Consequently the rolling material S is always rolled to good plate thickness shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling mill in which work rolls are moved in the axial direction in accordance with rolling force.

[Conventional technology]

In a rolling mill, the upper and lower work rolls are alternately moved (shifted) in the axial direction to correct the shape of the rolled plate.
However, even with such a rolling mill, it has been impossible to control the edge drop that occurs at the width end of the rolled plate. Therefore, conventionally, as shown in Fig. 1,
One end of the lower work roll (α) (a) (crown (h) (b) where the diameter is smaller on the one end side is the upper and lower work roll (a) (
a), and each crown (b).
Rolling is performed so that the starting part (I)) of ) coincides with the starting part (d, ) of the edge drop (d) generated on the rolled plate (C). However, although the curve of this crown (b) is constant, the rolling force is not always the same;
If the rolling force is high, a large roll flattening will occur, resulting in edge drop. Conversely, if the rolling force is low, the roll flatness will be small, resulting in uncompensated areas or overcompensated areas in the thickness of the rolled plate at the width end. occurs, making it impossible to precisely control the shape of the rolled plate.

[Problem that the invention seeks to solve]

In view of such circumstances, the present invention eliminates the occurrence of uncompensated and overcompensated areas in the thickness of the rolled plate at the width end by shifting a work roll with a crown on the body end according to the rolling force. This was done in order to provide a rolling mill that can eliminate this problem and produce high-quality rolled products.

[Means for solving problems]

The present invention provides a rolling mill in which a crown is attached to the body end of a work roll that is movable in the axial direction of the roll. It has a configuration including a control device that controls the moving device.

〔Example〕

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

As shown in Figure 2, a crown (5) with a small diameter on the end side is attached to one end of the upper and lower work rolls (31 (4) supported by the upper and lower work rolls (11 (2J)) for upper and lower work. Roll (3
1 (4) are located on opposite sides, and the upper and lower work rolls (3) and (4) are provided with shift cylinders (61 (71)
It is possible to move in the axial direction by the operation of .

Shift cylinder (6) (71 has a servo valve (81 (9)
) to supply pressure oil. (S) is a rolled plate.

In a rolling mill with such a configuration, there is a rolling force detection device (10) that detects the rolling force, and when the rolling force becomes large, the shift cylinder (6) is extended and the shift cylinder (6) is activated.
7) performs a shortening operation, resulting in a large shift; conversely, when the rolling force decreases, the shift cylinder (6) performs a shortening operation,
A proportional control device (11) that performs necessary calculations based on the detection signal from the shift cylinder (rolling force detection device 00 so that the force is extended and the shift is small) and issues a control signal to the servo valves (8) and (9). ).

Next, the operation will be explained.

Shift the upper and lower work rolls (3H4) to match the width of the rolling plate (St), and move the crown start part (5') to the rolling plate (S).
Rolling is started in accordance with the edge drop start point (see Fig. 3).During rolling, the proportional control device 01) calculates the work roll shift amount based on the signal from the rolling force detection device 00). A control signal is issued to the servo valves (8) and (9) to activate the shift cylinder (6) (force) to shift the upper and lower work rolls (3) and (4) to the optimum position.

To specifically explain the relationship between rolling force and shift amount using the upper work roll (3), if rolling is being performed at the current position (A) and the rolling force increases and the roll flatness increases,
Increase the shift amount of the upper work roll (3) and move it from the position @) to the position (B). On the other hand, when the rolling force decreases and the roll flatness decreases, the shift amount of the upper work roll (3) is decreased and the upper work roll (3) is moved from the position 0) to the position r-).

Therefore, no uncompensated portions or overcompensated portions occur in the plate thickness at the width end portions of the rolled plate, and shape defects such as edge drops can be eliminated.

〔Effect of the invention〕

As mentioned above, according to the present invention, even if the rolling force fluctuates, the plate thickness at the width end of the rolled plate (2) does not generate uncompensated areas or overcompensated areas, and can produce high-quality rolled products. can produce
This excellent effect can be achieved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional compensation method for edge drops occurring in a rolled plate, Fig. 2 is an explanatory diagram showing the rolling mill of the present invention, and Fig. 3 is an explanatory diagram showing the crown at the end of the roll and the width end of the rolled plate. It is an explanatory view showing a positional relationship with. (3) (4) is the work roll, (5) is the crown, (6
) (71 is a shift cylinder, (8) and (9) are servo valves,
00) indicates a rolling force detection device, and (11) indicates a proportional control device. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] ]) In a rolling mill in which a crown is attached to the body end of a work roll that can be moved in the roll axis direction, the work roll is moved according to the rolling force detected by the rolling force detection device and the rolling force detection device. A rolling mill characterized in that it is equipped with a control device that controls a device that controls a rolling mill.