JPS63130204A - Horizontal deflection suppressing and controlling device for work roll - Google Patents

Abstract

PURPOSE:To maintain the specified deflection of rolling rolls and to improve the quality of a rolled stock by detecting the horizontal force to be exerted to work rolls, moving the work rolls by as much as the difference between the horizontal force and target value and suppressing the horizontal force to be exerted to the work rolls to a specified value. CONSTITUTION:The work roll 3 is horizontally moved by an offset cylinder 6 via a chock 4. The moving force of this time is given via an intermediate cylinder 8 by opening and closing a solenoid valve 9. A selsyn 12 is provided on the shaft of the intermediate cylinder to detect the direction and quantity of the offset and a pressure detector 10 is provided between the offset cylinder 6 and the intermediate cylinder 8 to detect the horizontal force. The roll position is detected by a gap detector and the positions of the chock 4 and block 5 are detected by a differential transformer in order to check the action quantity at the control end of the offset position. The offset detection quantity of the intermediate cylinder 8 is then corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention reduces the horizontal force of work rolls in a metal rolling mill despite various rolling conditions.

The present invention also relates to a control device that controls a constant value, and to improving the shape of a product.

[Conventional technology]

Regarding conventional equipment, as described in Japanese Patent Application Laid-Open No. 60-244409, the structure of the horizontal rolling device (intermediate roll and work roll offset device) is described, but it is not possible to perform dynamic control during rolling. Moreover, no consideration has been given to similarly controlling changes in the roll gap that occur along with this.

[Industrial application field]

In the above-mentioned conventional technology, no consideration is given to controlling the horizontal force of the work roll to a small and constant value.
However, during rolling, due to changes in the hardness of the rolled material, variations in plate thickness, etc., the balance between rolling torque and rolling load changes, and the horizontal deflection force of the work roll changes.

Since the horizontal deflection of the work rolls affects the sheet thickness shape on the exit side, it is necessary to keep this horizontal deflection force to a small and constant value in order to perform stable rolling.

An object of the present invention is to eliminate these defects through control.

[Means for solving problems]

The purpose of the offset is to offset the horizontal deflection of the work roll caused by the tangential force FH due to the torque transmitted between the intermediate roll and the work roll by the horizontal component force PO of the rolling pressure created by offsetting the work roll.

In other words, FH=Po (1). PO for canceling this FH is δ Po =□·P(2) e .

Here, δ: Offset movement amount Re: Average value of the distance between the centers of the intermediate roll and the work roll P: When the rolling pressure Fo changes by ΔF)l and becomes FH + ΔFH, in order to balance this, e, i.e. , it is sufficient to change the offset position by e Δδ=□・ΔF) ((4).

The ideal target value for horizontal force is FH=O, but FH
<O is not preferable in terms of rolling operation. Also, 0
When the rolls are close to each other, the rolls tend to move horizontally, and if there is play in the roll bearings, the rolls will move discontinuously in the horizontal direction by the amount of play, which will cause a disturbance in plate thickness control.

Therefore, there are two types of control:

1. After suppressing the backlash of the roll bearing, control it to a certain constant value close to FH=O.

2. Instead of allowing the backlash of the roll bearing, the @bearing is pressed against the inner wall of one of the housings by controlling it to a certain large, constant value.

Here, in order to measure the stability of operation, the constant value actually falls within a certain range of the target value deadband.

[Effect]

Each action will be explained with reference to FIG. The work roll 3 is assembled into a chock 4, supported by a block 5, and can be moved in the horizontal direction together with these blocks 4 and 5. The moving force at this time is provided by an offset cylinder 6 whose fulcrum is located in the housing 7.

An intermediate cylinder 8 is connected to the offset cylinder via piping, and the oil flow in the intermediate cylinder 8 is switched by an opening/closing command from a solenoid valve 9, thereby switching the operating direction of the intermediate cylinder.

A cercin 12 is installed on the axis of the intermediate cylinder for detecting the direction and amount of offset, and a pressure detector 10 is installed between the offset cylinder and the intermediate cylinder for detecting horizontal force. Furthermore, to confirm the amount of movement at the operating end at the offset position.

A gap detector 21 detects the roll position, a differential transformer 23 detects the chock and block positions, and corrects the detected amount of offset of the intermediate cylinder.

A method for detecting horizontal force will be explained with reference to FIG.

FH: Horizontal force A: Cross-sectional area of offset cylinder 6 P1 to P4: Each detected value of pressure detector 1o B Spring force inside Nijilinder (force that works to return the cylinder to its original position when there is no oil pressure) δ: Offset movement amount and Then, the horizontal force FH can be found using the following equation.

Fu=A(Pz+Pa-P2-P4) B δ
(5) Therefore, in equation (4), when the target value of horizontal force FH is F)IQ, the offset movement amount is ΔF
Since o=FHO−FH, e Δδ= (FHO−FH) (6
), the value of equation (5) can be substituted for FH.

For control, a sampling method is adopted, FM is read every sampling period, and when FH exceeds a certain tolerance range including the dead band, ΔFH is calculated, Δδ is calculated,
Move the offset position.

Movement commands for the offset positions of the sides are also issued at sampling intervals.

Correction of changes in the roll gap due to movement of the offset position is controlled simultaneously with movement of the offset position.

〔Example〕

FIG. 1 shows an embodiment of the present invention.

1.2 and 3 are backup rolls of a 6-layer rolling mill5.
They are an intermediate roll and a work roll. 3's work role is 6
Can be moved horizontally via 4 chocks with an offset cylinder. 5 is a block that supports the chock, and 7 is a housing.

The moving force is applied via the intermediate cylinder 8 by opening and closing the solenoid valve 9.

14 is an offset target value setting device, 11 is a horizontal force calculation device, and the detected values Pi, Px, of each pressure detector 1o installed between the offset cylinder 6 and the intermediate cylinder 8
From Ps and P4, the current value of horizontal force, FH=A(Pz+Ps-Pa-Pa)-Bδ and if so, then
Through the 17 offset target position operation direction discrimination circuits,
Give commands to open and close solenoid valve 9.

Twelve position detectors catch the movement of eight intermediate cylinder shafts. The amount of movement of the intermediate cylinder is calculated by 13 offset position calculating devices.

Further, while the roll position at the operating end is detected by a gap detector 21, the position of the chock is simultaneously measured by a differential transformer 23. 22 and 24 are amplifiers for each signal. The target offset position is corrected based on the amount of movement of the intermediate cylinder, the roll position determined by the gap detector, and the chock position determined by the differential transformer.

On the other hand, correction of the roll gap due to a change in the offset position is calculated by a rolling position correction calculation device 19, and a command is sent to the hydraulic rolling down device 20.

The apparatus No. 19 will be explained with reference to FIG.

Re: Distance between roll centers m
,2. The roll gap amount ΔS to be corrected is:

Xi = stone π "=77 Xx = stone π "near 7 1-3t -", :XI
z-81 = (δ engineering + 62) (δ2-δx)/Re. Reference numeral 19 denotes a device that calculates the roll gap correction amount ΔS using the previous value δ of the offset position and the current value δ2.

[Industrial application field]

By applying the present invention to a single rolling mill or a tandem rolling mill, it was possible to solve the following problems that were unresolved with conventional offset control, and to significantly improve quality.

(1) It is possible to control the deflection of the rolling roll to a constant level regardless of changes in the hardness of the rolled material.

A stable shape was obtained over the entire length of the plate.

(2) This function is added to the various bending functions that conventional rolling mills are equipped with, and it is also possible to handle high-order compound elongation, allowing for greater diversity in shape control even when the properties of the base material are unknown. Added responsiveness.

[Brief explanation of the drawing]

FIG. 1 shows an overall system showing an embodiment of the present invention.
Figure 2 is a plan view showing the horizontal force detection method of the present invention;
The figure is an explanatory diagram of the principle of roll gap position correction using an offset position according to the present invention. 1... Backup roll, 2... Intermediate roll, 3
...Work roll, 4...Chock, 5...Block, 6...Offset cylinder, 7...Housing, 8...Intermediate cylinder, 9...Solenoid valve, 10...
...Pressure detector, 11...Horizontal force calculation device, 12...
・Position detector, 13...Offset position calculation device, 16
... Comparator, 18... Movement direction discrimination circuit, 19...
- Rolling down position correction calculation device, 20... Hydraulic rolling down control device, 21... Gap detector, 22... Roll position amplifier, 23... Differential transformer, 24... Chock position amplifier.・,H+:,'Agent Patent Attorney Katsuma Ogawa ~ Kaya 2 Figure

Claims (1)

[Claims] 1. In a metal rolling mill, it has the function of detecting the horizontal force applied to the work roll and moving the work roll by the difference between the detected horizontal force and the target value, and suppressing the horizontal force applied to the work roll to a constant value. A horizontal deflection suppression control device for a work roll.