JPS58215212A - Roll bender force control method for rolling mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling a roll bender device for a rolling mill that applies bending force to the rolls of a rolling mill.

A conventional device of this type will be explained by taking an intermediate roll shift type hole heavy rolling mill as an example. No bender device was provided on the intermediate roll.

However, in recent years, the diameter of work rolls has been reduced in order to improve rolled material products, and this reduction in diameter has created the need to provide a bender device (hereinafter referred to as a bender) to the intermediate roll. Such a bender can be applied with any bender force even if the roll shifts in the axial direction, and
The bender force must always act on the center of the bearing.

The conditions for the Ryoja are solved as follows. That is, by providing an intermediate body between the roll chock supporting the roll metal and the roll bender device, and applying the roll bender force to the roll chock via the intermediate body, even if the intermediate roll moves in the axial direction, the Pender in the center of the bearing
Force is coming into play.

In FIG. 1, the bearings of a pair of work rolls 1 are connected to a project block 2 attached to a rolling mill housing.
An intermediate roll bender 5.9 is installed in this project block 2. This intermediate roll bender 5.9 supports a rail-shaped intermediate body 8, and this intermediate body 8 is in contact with the intermediate chock 4. An intermediate roll shift device 6 is attached to the intermediate chock 4, and backup rolls 7 are arranged above and below the intermediate roll 3 whose bearing portion is supported by the intermediate chock 4.

In a conventional rolling mill, design and manufacturing control is performed so that the output loads of the intermediate roll benders 5 and 9 are equal. now,
If the intermediate roll is moved by δ in one direction while keeping the output load M' of the intermediate roll bender 5, 9 constant, how the bender force acting on the intermediate roll chock will change can be determined using Fig. 2. explain. FIG. 2(1) shows the intermediate roll moving in the axial direction, and FIG. 2(II) shows the conventional type after the intermediate roll moves in the axial direction. Intermediate roll bender 5
．． Since the middle torsion roller is moved by δ in the state of FI=F 4 =F where the output loads of 9 are equal, the forces F+ and Fa acting on the middle chock change as follows. In this case, it is not possible to apply an arbitrary bender force symmetrically, and it becomes impossible to control the shape of the rolled material, which is a big problem.

An object of the present invention is to provide a roll bender device for a rolling mill that can apply any bender force symmetrically even if the intermediate roll moves in the axial direction.

The key point of the present invention is to detect the axial movement f of the roll (or the position of the roll), and based on this, appropriately control the output load of the roll bender to move the intermediate roll in the axial direction. Even if any bender force is applied symmetrically.

An example of this will be described using FIG.
In order to keep F- constant as R=Fs=F, consider how much the output load Fs and Fa't of the intermediate roll bender 5.9 should be.

Due to the balance of upward and downward forces, Fl +F1 =F* +F4 ・
...(1) Moment balance (a-δ) Fs + 1)lh = (a+δ) F
a + bF+-(2) Now, FI=Ft =F...(3
), so according to equations (1) to (3), F*, Fa is a+δ Fs ”” F
... (4) a-δ Fa = -F ... (5
).

Therefore, when the intermediate roll moves in the axial direction, the output loads Fs, Fs'It(4)(
By controlling to the value determined by the formula 5), it becomes possible to apply the external force acting on the υ intermediate roll chock arbitrarily and symmetrically.

According to the present invention, even if the intermediate roll moves in the axial direction, arbitrary bender force can be applied symmetrically, so that the shape of the rolled material can be controlled.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 (II)
is a front view showing the conventional intermediate roll after the axial movement;
Figures (I) and (II) are front views showing the front and back of the axial movement of the intermediate roll of the present invention.

Claims (1)

[Claims] 1. In a roll bender device of a rolling mill, the axial movement amount of the roll or the position of the roll is detected, and the left and right or one side bender applied to the roll is fully controlled based on the detected value. Roll bender force control method for rolling mill.