JPS5855111A - Controller for plate shape in multistage cluster rolling mill - Google Patents

Abstract

PURPOSE:To control plate shapes in multistage cluster rolling mills over a wide range by providing circuits for controlling roll crowns and roll bending forces by starting rolling at initial set values and operating correction values from the differences from current values under rolling. CONSTITUTION:In multistage cluster rolling mills, rolling conditions 14 are inputted in a preset arithmetic device 13, and respective initial set values of optimum crowns of backup rolls, and the roll bending forces of work rolls and intermediate rolls are operated and inputted. Rolling is started, and the correction rates for the crowns of the backup rolls and the correction rates for bending of the work rolls and the intermediate rolls for the purpose of minimizing the defects in the plate shapes produced by the differences between the current values of the rolling load detected by load cells 9 and the initially set reference values are operated with a feedback arithmetic device 15, from which said rates are outputted. The rates are applied to controllers 10, 11, 12, by which the crowns and bending forces of the rolls are controlled over a wide range in accordance with the rolling conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate shape control device for a multistage cluster piezoelectric machine.

Conventionally, in rolling mills, the technology for unnecessary correction and control methods of plate shape caused by differences in plate thickness or elongation in the width direction has not yet been sufficiently established, despite high demand. Crown rolls and roll benders are used in conjunction with the following types of rolling mills:

However, with this method, it is difficult to obtain the optimal sheet shape that corresponds to a wide range of rolling conditions. Currently, a large number of crown rolls with various crown amounts are prepared and used interchangeably depending on the rolling conditions to cope with a wide range of rolling conditions. Because the ability of the operation unit to control the shape is not sufficient, even if a shape detector is used to automatically control the plate shape, it is not always possible to obtain satisfactory results, and various crown amounts can be adjusted depending on the rolling conditions. crown field with
Productivity is not necessarily high because all the tools are prepared and replaced.

The present invention has been proposed in light of the above circumstances, and provides a plate shape for a multi-stage cluster rolling machine that automatically adjusts roll rolls to obtain a good plate shape in accordance with the rolling conditions of a wide range of people. OBJECT OF THE INVENTION To this end, the present invention includes a backup roll that is axially divided and has an adjustable roll crown, and that applies a roll pending force to each of the work roll and intermediate roll. In a multi-stage cluster rolling mill, a preset calculation device calculates and outputs the initial values of the backup roll crown, work roll pending force, and intermediate roll pending force by inputting the rolling conditions, and calculates the difference between the current value of the rolling load and the reference value. a feedback calculation device that calculates and outputs the correction values of the backup roll crown and/or the workpiece zero-pending force and/or the intermediate roll pending force by inputting the above-mentioned initial setting values and the correction values; , a back-up roll crown control device that adjusts the work roll pending force and intermediate roll pending force, a work roll bending control bacteria amount, and an intermediate roll bending control device, which are suitable for the given rolling conditions before starting rolling. A backup rule crown, work roll pending force, and intermediate roll pending force are initially set, and during rolling, the backup rule crown and/or work roll pending force and/or intermediate roll pending force are set according to the difference between the current value of the rolling load and the reference value. All features are as follows:

One embodiment of the present invention will be explained with reference to the drawings. FIG. 2 is an explanatory diagram showing the procedure for modifying the plate shape according to FIG. 1, and FIG. 3 is a block diagram showing the configuration of the control circuit shown in FIG.

In the above figure, 1 is a pair of workpiece wheels arranged in parallel in contact with the upper and lower surfaces of the rolled material 5, 2 is an intermediate roll that rotates in contact with the workpiece 4 wheel 1, and S is an intermediate roller. 04 is an intermediate roll 2.0 is a divided backup roll that rotates Sta at 2, and is divided into 5 parts in the axial direction, of which the central three are each attached to the roll shaft 6 via an eccentric sleeve r.04 is an intermediate roll 2.
2 is the backup rule that contacts and rotates, 7 is the roll axis 6
The split backup roll 3 is pushed out by an eccentric sleeve attached to the back-up roll 3, which is rotated by an actuator such as a motor or a hydraulic cylinder (not shown) and a transmission mechanism.
Generate a backup roll crown. 8 is a bearing at both ends of the roll shaft 60, 9 is a load cell that detects the rolling load of the bearing 8, 10 is a backup roll crown control device,
11 is a work roll bending control device, lIa is a work roll convex bending cylinder, 11b is a work roll concave bending cylinder, 12 is an intermediate roll bending control device, 121 is an intermediate roll convex bending cylinder, 12b is an intermediate roll concave bending cylinder,
13 is a preset calculation device, 14 is a rolling condition, 15 is a feedback calculation device, and 16 is an adder.0 In such a device, when the split backup roll 3 is crowned via the eccentric sleeve 1tl-,
When roll pending forces F and F are applied to work roll 1 L and intermediate roll 2, respectively, intermediate p-
The rail 2 and the workpiece rail 1 are each bent along the backup rule crown, and the backup rail crown can be effectively transmitted to the rolled material 5. At this time, the central three of the split backup rolls 3 are The roll crown control device 1011C causes an unillustrated action? The crown can be adjusted through the two-actor, transmission mechanism, and eccentric sleeve 1, and the intermediate roll convex bending cylinder J at both ends of the intermediate roller 2.
Ja and the intermediate roll concave pending ν cylinder 12 are controlled by the intermediate roll pending control device 12 to control the cylinder pressure to apply the intermediate roll pending force to the crown of the intermediate roll 2. Make adjustments.

Similarly, the work roll convex bending cylinder JJm and the work roll concave bending V cylinder JJk at both ends of the work roll 1 control the pressure of the cylinder by the work reel bending control device 11Kl to apply a pending force to the work roll 1. , adjust the work roll crown. The preset calculation device 13
Rolling conditions such as material, plate thickness, plate width, rolling car, tension, etc. 14t
- Backup rules for manually obtaining the optimal plate shape Crown initial setting values θ,, θ1. θ, work roll pending force initial setting value FI, intermediate roll pending force initial setting value F! The feedback calculation device 15 calculates and outputs a backup roll crown correction value Δ0 based on the difference between the current rolling load values pw and pn detected by the p-docel 9 and the rolling load reference value Po determined at the time of the preset calculation described above. ．． .

Δθ1. No 0. and workpiece volume bending correction value, art, intermediate roll bending correction value ΔF! The above-mentioned initial setting value 'Is'lnθml'lsF' and correction value 'l's' are calculated and output respectively to prevent the roll group from deforming and the plate shape to change due to changes in rolling load. 0! , θ3. ΔF1. JF and are respectively added by an adder 16, and the results become command values for the backup roll crown control device 10, the work roll bending control device 11, and the intermediate p-ru pending control device 12.

To explain the operating procedure of the above-mentioned device, first, before starting rolling, the rolling conditions 14 are input into the preset calculation device 13,
Backup roll crown initial setting value 0 to obtain the optimum plate shape. .

e, , e, and work rule bending force initial setting value 'II intermediate roll pending force initial setting value F1t-
Calculation output〇 At this time, each output 01 of the feedback calculation device 15
．．ノ'l1m1o1. ΔF8. All values are assumed to be zero, and <0. Therefore, θ1#'ls'l is given to the backup rail crown control device 1o, and Fl and F are given to the work roll bending control device 11 and the intermediate roll bending control device 12, respectively. , is given, the backup roll crown, work roll pending force, and intermediate roll pending force are initiated, and during the positive arc, the piezoelectric force current value FW detected by the load cell 9 is
, pH and the following rolling load standard ([I
Backup roll crown modification to minimize plate shape defects caused by the difference between 'o'I)e, ,40.
, θ1 and work roll bending correction amount F
1. Intermediate roll bending correction amount! are calculated and outputted by the feedback calculation device 15, respectively.

Therefore, the backup roll crown control device 10
a1+7#, , e, +Δ01. θ'tΔθ.

is given, and the work roll bending control device 11f
fC is given F, +ΔF1, and the intermediate roll bending control device 1111/C is given F, +ΔF, so that even if the rolling load changes, an optimal plate shape can be obtained.

According to such a device, the optimal initial values of backup roll crown, work roll pending force, and intermediate roll pending force are set in accordance with the rolling conditions, and during rolling, the respective optimum values are set in response to fluctuations in the rolling load. Since the backup roll crown, work roll pending force, and intermediate roll pending force are corrected, a plate with an extremely good shape can be rolled.

In the above embodiment, the number of divisions t of the divided backup roll 3
We have shown an example of controlling the sound of only the central three of them, but the number of divisions and the number of controls can be freely selected. The present invention can also be applied to milling when half the rolls of a normal four-high rolling mill are used.

In short, according to the present invention, in a multi-stage cluster rolling mill which has a backup four wheel which is divided in the axial direction and whose pull crown can be adjusted, and which applies a roll pending force to each of the work roll and the intermediate roller, A preset calculation device that calculates and outputs the initial values of backup roll crown, work roll bending force, and intermediate roll pending force by inputting rolling conditions, and a backup roll crown that inputs the difference between the current value of rolling load and a reference value. A feedback calculation device that calculates and outputs correction values for the work roll bending force and/or intermediate roll bending force, and inputs the sum of the initial setting value and correction value to calculate the backup roll crown and work roll bending force correction. A backup roll crown control device, a work roll bending control device, and an intermediate roll bending control device each adjust the backup roll crown and intermediate roll bending force. ↓ and intermediate roll pending force are initially set, and during rolling, the rolling technique - 〇 Backup roll crown machining or work rule bending force and/or intermediate roll pending force are corrected based on the difference between the current value and the reference value. As a result, a plate shape control device for a multi-stage cluster rolling mill that can obtain a good plate shape under a wide range of rolling conditions is obtained, so the present invention is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a four-bar arrangement according to an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing the procedure for modifying the plate shape as shown in FIG. 1... Work rule, 2... Intermediate roll, 3-part split backup roll, 4... Backup roll, 5
...Rolled material, 6...Roll shaft, 7...Eccentric sleeve, 8...Bearing sy...Load cell, 1o°
- Backup roll crown control device, 11... Work roll bending control device, 11*''' work roll convex bending cylinder, 11b... Work roll concave bending cylinder, 12... Intermediate roll bending control device, 121... - Intermediate roll convex bending cylinder, 12b... Intermediate roll concave bending cylinder, 11... Preset calculation device 1.!4...
・Rolling conditions, 15...Feedback calculation device, Ig
... Adder, -F, ... Work roll pending force initial setting value, F, ... Intermediate roll pending force initial setting value, θ1. θ2, θ1... Backup roll crown initial setting value, ΔF1... Work roll bending force correction value, ΔF, intermediate four-fold bending force correction value, lθ+
,7#, ,ll5=・Padzuku 7 roll crown correction degree value, Po...Rolling load standard value, pw,
pn...Current value of rolling load.

Claims (1)

[Claims] In a multi-stage raster rolling mill that has a backup rule that is divided in the axial direction and can adjust the four-roll crown, and that applies roll pending force to each of the work rule and intermediate roll, it is possible to input piezoelectric conditions and back up. p
- A preset calculation device that calculates and outputs the initial values of the roll crown, work roll pending force, and intermediate roll pending force, and a backup roll crown and/or work roll pending force by inputting the difference between the current value of the compression load and the reference value. and/or a feedback calculation device that calculates and outputs respective correction values of the intermediate roll pending force, and inputs the sum of the initial setting value and the correction value to calculate the backup roll crown, work roll pending force, and intermediate roll pending force, respectively. It is equipped with a pack-up roll crown control device, a work roll bending control device and an intermediate roll bending control device to adjust the backup roll crown, work roll pending force and The intermediate roll pending force is initially set, and during rolling, the backup roll crown and/or work roll pending force and/or intermediate roll pending force are corrected based on the difference between the current rolling load value and the reference value. A plate shape control device for a multi-stage cluster rolling mill, characterized in that: