JPS5842762B2 - Roll bending device of rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll bending device for a rolling mill, and more particularly to a roll bending device for a rolling mill that is equipped with at least a pair of axially movable rolls that support upper and lower work rolls. .

In recent years, requirements for thickness accuracy of rolled products have become increasingly strict.

On the other hand, although the thickness accuracy in the longitudinal direction of rolling mills has been improved to a considerable extent with the development of automatic plate thickness control, there has been no effective control means for the thickness accuracy in the width direction of the plate.

Of course, the work roll venting method for four-high rolling mills has been developed as a method to control the thickness shape of rolled material in the width direction, but conventional roll venting methods do not control the shape of rolled material. The actual situation is that there is a limit to the so-called correction ability, and in particular, when the width of the rolled material changes significantly, it is not possible to obtain sufficient thickness accuracy in the width direction of the rolled material.

Therefore, this applicant proposed a rolling mill capable of improving shape control ability in a patent application related to Japanese Patent Publication No. 50-19510.

That is, in this rolling mill, as shown in FIG. , 6 are adjusted to move in the axial direction according to the width of the rolled material 7, thereby expanding the correction range of the left and right roll benders 8, 9.

Furthermore, as this applicant has made clear in the patent application related to Japanese Patent Application No. 51-9350.

A rolling mill has been proposed which is a further improvement on the rolling mill disclosed in Japanese Patent Publication No. 50-19510.

Namely. As is clear from FIG. 2, which shows an enlarged view of the right half of the rolling mill shown in FIG. 1 and the shaft end of the lower work roll 2 respectively. When F2 is applied, the deflection states of the work rolls 1 and 2 have different tendencies as shown by Sl and S2, respectively.

This tendency is the same for the left half of the rolling mill because the rolling mill is symmetrical about the center of the mill at point t.

Therefore, in the rolling mill according to Japanese Patent Application No. 51-9350, as shown in FIG.
i1 to the upper and lower work rolls 1 and 2 independently pending force F1. By making it possible to add F2 and adjusting the deflection state of the upper and lower work rolls 1 and 2, the shape control ability of the rolling mill was further improved.

However, in such a conventional rolling mill, independent pending forces F1. In order to add F2 and enable increase bending, which increases the axial distance from the other work roll, and relief suspending, which reduces the axial distance from the other work roll, as shown in FIG. To,
Hydraulic jacks 16, 17° 18 are installed above and below the roll chocks 12, 13 on the operating side of the upper work roll 1 and the lower work roll 2, and the roll chocks 14° 15 on the driving side, respectively.
．． A total of 8 pieces, 19, 20, 21, 22.23, are required.

In particular, the hydraulic jack 1 disposed between the upper roll chock 12° 14 and the lower roll chocks 13 and 15.
7, 18 and 21° 22 are accommodated through support protrusions 24 and 25 protruding from the housings 10 and 11, so the space is quite small and the structure is complicated, making it difficult to handle. There is a problem that.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a roll bending device for a rolling mill that has a simple structure and good shape control ability.

The present invention provides a roll bending device for a rolling mill that is equipped with at least a pair of axially movable rolls that support an upper F work roll. A cylinder for roll bending is provided at each position between the work roll chocks and at the bottom of the lower work roll chock, an upper cylinder of the upper work roll chock on the operation side, a lower cylinder of the work roll chock on the drive side, a cylinder between the upper and lower work roll chocks on the operation side and the drive side, and , the operation side lower work roll chock lower cylinder and the drive side upper work roll chock upper cylinder are connected to the same hydraulic piping system to form three hydraulic piping systems, and these three hydraulic piping systems are made independent of each other. It is designed to be controlled.

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

FIG. 5 is an explanatory diagram showing one embodiment of the roll bending device for a rolling mill according to the present invention, in which upper and lower work rolls 1
, 2 are supported by a pair of axially movable rolls (not shown).

On the operation side of this rolling mill, a hydraulic cylinder 31 is provided above the roll chock 12 of the upper work roll 1, a hydraulic cylinder 32 is provided between the roll chocks 12 and 13 of the upper and lower work rolls 1 and 2, and a hydraulic cylinder 32 is provided between the roll chocks 12 and 13 of the upper and lower work rolls 1, and A hydraulic cylinder 33 is provided at the lower part of the second roll chock 13.

Further, on the drive side, a hydraulic cylinder 34 is provided above the roll chock 14 of the upper work roll 1, a hydraulic cylinder 35 is provided between the roll chocks 14 and 15 of the upper and lower work rolls 1 and 2, and a hydraulic cylinder 35 is provided between the roll chocks 14 and 15 of the upper and lower work rolls 1 and 2. A hydraulic cylinder 36 is provided at the lower part of the second roll chock 15.

Further, the operating side hydraulic cylinder 31 and the driving side hydraulic cylinder 36 are connected to the same hydraulic piping 37, and the operating side hydraulic cylinder 32 and the driving side hydraulic cylinder 35 are connected to the same hydraulic piping 38. , hydraulic cylinder 3 on the operating side
3 and 1 drive side hydraulic cylinder 34 are the same hydraulic piping 3
Connected to 9.

These three systems of hydraulic piping 37, 38, and 39 are connected to a main hydraulic piping 43 via stop valves 40, 41, and 42, respectively.

The main hydraulic piping 43 is connected to a hydraulic pump 45 via a pressure regulating valve 44.
It is connected to the.

Next, the operation of the above embodiment will be explained.

The three hydraulic piping systems have respective stop valves of 40° and 41°.
．． By changing the stitching of the opening/closing state of 42, six different bending states as shown in the table are given to the upper work roll 1 and the lower work roll 2.

That is, (1) only the stop valve 41 is opened and the stop valve 40°42
When closed, simultaneous increase bending is applied to the operating side and the driving side as shown in FIG.

. Furthermore, (2) when the stop valves 40 and 42 are opened and the stop valve 41 is closed, differential suspension is provided between the operation side and the 1 drive side.

Further, (3) when only the stop valve 40 is opened and the stop valve 4L42 is closed, differential suspension corresponding to F2 in FIG. 3 is provided.

Further, (4) when only the stop valve 42 is opened and the stop valves 40 and 41 are closed, a differential suspension corresponding to Fl in FIG. 3 is provided.

(5) When opening the stop valves 40, 41 and closing only the stop valve 42, the hydraulic cylinders 31, 36 and 32
°35 is activated.

Therefore, since the roll chock 12 receives a pending force of the same magnitude in the opposite direction from the hydraulic cylinder 31 and the hydraulic cylinder 32, no apparent pending force acts on the roll chock 13 as a reaction force of the hydraulic cylinder 32. Only the pending force acts.

Also on the 1 drive side, an upward pending force acts on the roll chock 14, and in this case, an increase bending corresponding to the bending force F1 in FIG. 3 is applied.

Furthermore, when (6) the stop valves 41 and 42 are opened and only the stop valve 40 is closed, the increase bending corresponding to F2 in FIG. 3 is completely opposite to that in the above (5). Given.

As described above, according to the present invention, the same roll bending function as in the conventional case using eight cylinders can be achieved with six cylinders.
The structure of the housing is simplified, the number of hydraulic systems is reduced, and the shape control ability of the rolling mill is improved.

[Brief explanation of drawings]

1 is a front view showing a rolling mill to which a roll bending device for a rolling mill according to the present invention is applied; FIG. 2 is a front view showing a bending state of the right half of the rolling mill in FIG. 1;
FIG. 3 is a front view showing the pending force applied to the rolling mill shown in FIG. 1, FIG. 4 is a front view showing a roll bending device of a rolling mill according to the conventional example, and FIG. 5 is a front view showing the pending force applied to the rolling mill shown in FIG. FIG. 1 is a front view showing an embodiment of a roll bending device of a rolling mill. 1... Upper work roll, 2... Lower work roll, 12° 13.14, 15... Roll chock, 31, 32° 33.34, 35, 36... Hydraulic cylinder, 37° 3
8.39...Hydraulic piping, 40,41.42...Stop valve.

Claims (1)

[Claims] 1. In a roll bending device of a rolling mill that is equipped with at least a pair of axially movable rolls that support upper and lower work rolls, on both the operation side and the drive side, the A cylinder for roll bending is provided at each position below the work roll chock, including an upper cylinder for the upper work roll chock on the operation side, a lower cylinder for the lower work roll chock on the drive side, a cylinder between the upper and lower work roll chocks on the operation side and the first drive side, and a cylinder for the operation side. The lower work roll chock lower cylinder and the 1st drive side upper work roll chock upper cylinder are connected to the same hydraulic piping system to form three hydraulic piping systems, and these three hydraulic piping systems are controlled independently of each other. A roll bending device for a rolling mill, characterized in that: