JPS58199606A - Roll bending device of rolling mill - Google Patents

Abstract

PURPOSE:To on-line control the sheet crown of a sheet to be rolled in high response characteristics, by installing an electrically hydraulic servo valve, used for controlling the flow rate of a working oil of hydraulic cylinders in a roll bending device of a rolling mill, close to the housing of a rolling mill on the floor. CONSTITUTION:In controlling the crown of a material to be rolled by pushing roll chocks 9, 10 of work rolls 11 with the aids of hydraulic cylinders 7 to perform concave-and-convex roll bendings by the work rolls 11, a working oil in a tank placed underground is sent under a pressure by a pump P to actuate the hydraulic cylinders 7 used for the roll bendings. In this case, an on-line control of the sheet crown of the material is performed in high response characteristics by installing an electrically hydrauic servo valve 4, used for controlling the flow rate of the working oil, close to the housing 13 of the mill on the floor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a roll bender device for a rolling mill.

In rolling with conventional rolling mills, the roll thickness, plate crown, etc. are controlled by a roller device, but among these,
For plate thickness control li1, a highly responsive hydraulic pressure reduction device has been developed, and online control that targets fluctuating disturbances is performed, but the plate crown system does not take disturbance fluctuations into account. Preset adjustments are being made for roll benders. However, recently there has been a tendency for requirements for sheet shapes to become more stringent, and roll benders are now using an online system for sheet crown control to improve responsiveness. A conventional roll bender device that performs this control is explained using Fig. 1.
(a) Storage tank installed underground, (-
A pump for flowing oil in and out of the same tank,
(c) is the piping between the storage tank (a) and the hydraulic flow 1 control cape reducing valve (d), (el is the hydraulic switching valve, and (r) is the hydraulic flow control pressure reducing valve IDL and the roll band Piping between the cylinder (h), (g) is the pulp stand,
'(i) is the top work roll chock, (J) is the bottom work roll chock, (k) is the work roll, (
When the pressure reducing valve (d) for controlling the hydraulic flow rate is determined by the signal from the roll banding push force command value calculation device (not shown), this opening is High-pressure oil with a flow rate corresponding to the temperature is piped (f)
It is sent to a roll bending hydraulic cylinder (h) via k, so that the roll bending force is controlled.

In the roll bender device of the rolling mill, the plate crown system @I
IC, pressure reducing valve for hydraulic flow control with extremely poor response (al
That is, in the response station wave number region of 5 aB or less, a pressure reducing valve for hydraulic flow control is used, which has extremely poor responsiveness of about 1/ to 115 o compared to an electro-hydraulic servo valve. Moreover, since the pressure reducing valve (AL is installed underground, the piping 1r from the pressure reducing valve (a) to the roll bending hydraulic cylinder (b)) will take a long time, it will be expensive to use the online system for the plate crown. It was difficult to return the response characteristics.

The present invention addresses the above-mentioned problems, and includes an electro-hydraulic servo valve for controlling the hydraulic flow rate of the hydraulic cylinder in a roll-handling device of a rolling mill in which a roll chock is pushed by a hydraulic cylinder to control the plate crown and plate shape. have,
The electro-hydraulic servo valve is connected to the rolling mill's roll rolling machine, which is characterized by being installed in contact with the ground-side hazing of the rolling mill, and its purpose is to provide high response to online control of plate crowns. The purpose is to provide improved rolling mill roll bender equipment with improved characteristics.

Next, an example of the roll bender device for a rolling mill according to the present invention will be explained. (1) is a storage tank, (2) is a pump, and (4) is a ground side housing (13) of a rolling mill. The electrohydraulic servo valve (3) for controlling the hydraulic flow rate is provided in contact with the storage (1) and the electrohydraulic servo valve (3).
4), (5) is the hydraulic switching valve, (6) is the piping between the electrohydraulic servo valve for hydraulic flow control (4) and the roll bending cylinder (7), and (8) is the hydraulic switching valve. Pulp Stand”, (9) is the top work roll chock, 0
1 is a bottom work roll chock, OB is a work roll, and II3 is a 72 pull up roll.

Next, the operation of the roll bender device of the rolling mill will be explained.

High-pressure oil in the underground storage tank (1) is piped (3)
This servo valve (4) K receives a command from a roll bander push force command value calculation device (not shown), and the electric Depending on the opening degree of the hydraulic servo valve, high-pressure oil with a flow rate corresponding to this opening degree is passed through the piping (6) to the hydraulic cylinder 13 y /
(It is sent to 71 and the roll penta pusher is controlled.

The responsiveness of the roll bender device largely depends on the responsiveness of the hydraulic flow control valve itself and the length of the piping to the inding hydraulic cylinder, but according to the present invention, the responsiveness of the hydraulic flow control valve itself has been significantly improved by replacing the electric pressure reducing valve with an electro-hydraulic servo valve. Moreover, the piping (6
) was required to be approximately 15 to 2011 in the conventional system in which a pressure reducing valve for hydraulic flow control is installed on the ground, but according to the present invention, this can be shortened to less than half, as shown in Fig. 6. Fifth, the response characteristics of the roll bender device are greatly improved.

The location of the electro-hydraulic servo valve (4) is determined by taking into account the range of coordination required for online control of the plate crown and the maintenance of the electro-hydraulic servo valve. Depending on the situation, it is possible to attach the upper part of the housing a3, the side surface of the housing α3, or the front face of the housing α3, etc. [9].

Although the actual examples of the present invention have been explained above, the present invention is not limited to these examples, and various modifications of the design can be made without departing from the spirit of the present invention. It is something that can be used.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional rolling mill equipped with a roll bender, FIG. 2 is a side view showing an example of a roll bender device for a rolling mill according to the present invention, and FIG. 5 is a side view of a conventional rolling mill with a roll bender installed. It is an explanatory diagram showing the step response characteristics with the roll (under device) of the present invention. (4)...Electro-hydraulic servo valve for hydraulic flow control +7)
... Hydraulic cylinder (9) (II... Roll chock (13... Housing sub-agent Patent attorney Shige Okamoto 2 other people)

Claims (1)

[Claims] A roll bender device for a rolling mill in which a roll chock is pushed by a hydraulic cylinder to control a plate crown and a plate shape, which includes an electro-hydraulic servo valve for controlling the hydraulic pressure of the hydraulic cylinder, and the drowsy hydraulic servo valve is connected to the ground-side hakujinda of the rolling machine. p of a rolling mill characterized in that it is provided in contact with
- Rubenda equipment.