JPH0441011A - Method for controlling horizontal bends of rolled stock - Google Patents

Abstract

PURPOSE:To prevent rolled stock from horizontal bend by obtaining amounts of elongation of right and left vertical rolls from a right and left obtained compressed width of the rolled stock and changing the circumferential speed of at lest one veritical roll so that the amounts of elongation of these right and left vertical rolls are equal to each other. CONSTITUTION:Right and left width end positions 37, 38 of the rolled stock 10 immediately before it reaches a biting part 36 are detected by position detectors 39, 40 laid near the biting part 36 on the inlet side of a vertical rolling mill 13 and a width end position 41 of the rolled stock 10 is detected by a position detector 42 laid on the inlet side of a side guide 21. The detected width end positions 37, 38, 41 are inputted into a guide arithmetic control part 44 on one hand, an amount 63 of inclination of the rolled stock 10 is obtained from a difference between the width end positions 37, 41 based on the line center 61 as a reference, a distance between the position detectors 39, 42, etc., command signals 52, 53 sent to guide bodies 19, 20 on an inclined side are corrected so that an amount 63 of inclination of the rolled stock 10 becomes zero and the rolled stock 10 is pushed from one side by moving the guide bodies 19, 20. In this way, the horizontal bends of the rolled stock 10 based on the inclied biting of the rolled stock 10 are reduced or prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for controlling lateral bending of rolled material.

[Prior art] When a rolled material is width-reduced between a pair of left and right vertical rolls of a vertical roll mill, there is a difference in hardness due to the temperature difference between the left and right width ends of the rolled material, and diagonal bite of the rolled material into the vertical roll mill. For example, as shown in FIG. 4, lateral bending 2 occurs in the rolled material 1 due to crowding or misalignment between the width center line of the rolled material and the line center of the vertical roll mill.

In order to prevent such lateral bending 2 of the rolled material 1, conventionally, Japanese Patent Publication No. 62-55441 and Japanese Patent Application Laid-open No. 59-127 have been proposed.
A method of controlling lateral bending of rolled material as shown in Japanese Patent No. 915 has been considered.

Among the above-mentioned methods for preventing horizontal bending of rolled materials,
Publication No. 5441 will be briefly explained using FIG. 5.

Vertical roll mill 4 in order from the upstream side of feeding direction 3 of rolled material 1;
A horizontal mill 5 and a vertical roll mill 6 are provided, and a detector 7 for detecting the amount and direction of lateral bending of the rolled material 1 is provided downstream of the vertical roll mill 6 on the downstream side.

If a horizontal bend occurs in the rolled material 1 exiting the vertical roll mill 6 on the downstream side, the detector 7 detects this and sends a detection signal to an arithmetic and control device (not shown), causing the vertical roll mill 6 on the downstream side to bend horizontally. The rolled material 1 is moved in the direction of horizontal bending (from the position of the imaginary line to the position of the solid line) while keeping the interval between the rolls 8.9 constant.

As a result, the amount of elongation of the rolled material 1 on the vertical roll 9 side increases and the amount of elongation on the vertical roll 8 side decreases, so that horizontal bending of the rolled material 1 is prevented in the area after the vertical roll mill 6 is moved. .

[Problems to be Solved by the Invention] However, the conventional method for preventing horizontal bending of a rolled material has the following problems.

That is, a detector 7 is provided downstream of the vertical roll mill 6 to detect the rolled material 1 generated by width reduction by the vertical roll mill 6.
Since the vertical roll mill 6 on the downstream side was moved so that the horizontal bend was detected by the detector 7 and the subsequent horizontal bend was corrected based on the detection signal at this time, the part where the horizontal bend was first detected was The bend will remain as it is.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a method for controlling the lateral bending of a rolled material, which can reduce the width of the rolled material without causing lateral bending over the entire length.

[Means for Solving the Problems] The present invention detects the left and right width end positions of a rolled material in the vicinity of the biting part on the entry side of the rolled material of a vertical roll mill that performs width reduction of the rolled material by a pair of left and right vertical rolls. , find the left and right compression widths of the rolled material from the width end positions, find the extension amounts of the left and right vertical rolls from the obtained left and right compression widths of the rolled material, and at least make sure that the extension amounts of the vertical rolls are equal on the left and right sides. This invention relates to a method for controlling lateral bending of a rolled material, which is characterized by changing the circumferential speed of one vertical roll.

Further, the present invention calculates the amount of inclination of the rolled material on the entrance side of a vertical roll mill in which the width reduction of the rolled material is performed by a pair of left and right vertical rolls, and based on the amount of inclination, determines the amount of inclination of the rolled material on the input side of the vertical roll mill. Lateral bending of a rolled material, characterized in that at least one guide body of a side guide having a guide body is moved in the width direction of the rolled material to make the width center line of the rolled material parallel to the line center of a vertical roll mill. It depends on the control method.

[Function] According to claim 1, the left and right width end positions of the rolled material are detected in the vicinity of the rolled material entry side biting part of the vertical roll mill,
The left and right compression widths of the rolled material are determined from the width end positions, and the extension amounts of the left and right vertical rolls are determined from the determined left and right compression widths of the rolled material, so that the extension amounts of the vertical rolls are equal on the left and right sides. The peripheral speed of at least one vertical roll is changed.

By making the left and right elongation amounts of the rolled material equal, horizontal bending of the rolled material due to a deviation between the width center line of the rolled material and the line center is prevented.

According to claim 2, the amount of inclination of the rolled material on the entrance side of the vertical roll mill is determined, and based on the amount of inclination, at least one of the side guides having a pair of left and right guide bodies provided on the entrance side of the rolled material of the vertical roll mill is determined. One guide body is moved in the width direction of the rolled material, so that the width center line of the rolled material is made parallel to the line center of the vertical roll mill.

This reduces or prevents lateral bending of the rolled material due to oblique biting of the rolled material.

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

FIG. 1 is an example of an apparatus for carrying out the method of the invention.

A pair of left and right vertical rolls 1 are placed in the middle of the conveyance line for rolled material IO.
A vertical roll mill 13 with 1.12 is provided, such that each vertical roll 11.12 can be driven by a motor 1B, 17 whose rotation is controlled by a speed controller 14.15, respectively.

A side guide 21 having a pair of left and right guide bodies 19.20 extending in the feeding direction 18 of the rolled material 10 is disposed on the side of the vertical roll mill 13 for 10 people to roll the rolled material, and each guide body 19.2
0 is extended and contracted by a cylinder 24.0 by a servo valve 22.23.
25 to allow movement in the width direction 26 of the rolled material 10.

A guide roller 27.2 is placed on the surface of each guide body 19.20 on the side of the rolled material 10 at a constant interval in the feeding direction 18.
8, 29, and 30, and the guide rollers 27 to 30 are connected to a cylinder 31, a U-shaped support 32, and a load cell 3.
3, 34, supported by the guide body 19.20 via the axle box 35, and when each guide roller 27-30 is overloaded, each guide roller 27-3 is controlled by a control device (not shown).
0 can be evacuated from the rolled material 10.

Position detectors 39 and 40 for detecting the left and right width end positions 37 and 38 of the rolled material 18 are disposed near the biting part 3B of the vertical roll mill 13 on the side of the rolled material 10, and the side guides 21 of the rolled material 18 A position detector 42 is disposed on the person's side to detect at least one of the left and right width end positions 4■ of the rolled material 10.

A calculation and control device 45 having a roll calculation and control section 43 and a guide calculation and control section 44 is provided, and the roll calculation and control section 43 receives the set circumferential speed 47 of the vertical rolls 11 and 12 from the circumferential speed setting device 4B.
, and the width end position 37 from the position detector 39.40.
．． 38, performs the calculation described later, and sends a command signal 48 to the rotation speed control device 14.15 based on the result of the calculation.
．． 49 will be output.

Further, the set position 51 of the guide body 19.20 from the position setting device 50 and the width end positions 37, 38.41 from the position detector 39, 40, 42 are input to the guide calculation control unit 44, and the settings will be described later. The command signal 52.53 is outputted to the cylinder 24.25 based on the result of the calculation.

In the figure, 54 is the biting point of the vertical rolls 11.12, 55 is the rolling end point of the vertical rolls 11.12, and 56 is the vertical roll 11.
．． 12 is the circumferential speed, 57 is the biting point 5 of the vertical roll 11.12
The feeding speed of the rolled material 10 at 4, 58 is the vertical roll 11
．． 12 is the feed rate of the rolled material 10 at the rolling end point 55, 59.60 is the left and right compression width of the rolled material 10, 81 is the center of the line, 62 is the width center line of the rolled material 10, and 63 is the amount of inclination of the rolled material. show.

Further, position detectors may be provided on the motors 1G and 17 and the cylinders 24 and 25 to perform feedback control.

First, the set circumferential speed 47 of the vertical roll 11.12 is input to the circumferential speed setter 46, and the command signal 48.
49, the motors 111i and 17 are driven, and the vertical rolls 11.12 are initially set to rotate at the set circumferential speed 47.

Similarly, the set position 51 of the guide body 19.20 is input to the position setting device 50, and the guide calculation control unit 44 or the servo valve 2
Command signal 52.53 based on setting position 51 at 2.23
is sent, and the cylinders 24.25 are driven to expand and contract by the working fluid supplied and discharged by the servo valves 22.23, thereby causing the guide body 19.
Initial settings are made so that 20 is at the same position as set position 51.

At this time, the set positions 51 are symmetrical with respect to the guide body 19, 20 and the line center 61, and are set at values that are slightly wider than the width dimension of the rolled material IO.

Then, the rolled material 10 is conveyed in the feed direction 18 along the line center 61, and is transferred to the site guide 21 and the vertical roll mill 13.
pass in order.

Then, the rolled material 10 is aligned with the width center line 62 by the side guide 21.
It is guided from the width direction 26 so that it coincides with the line center 61, and then the width is rolled down by the vertical roll mill 13.

However, since the side guides 21 do not strongly restrain the rolled material 10 so that the rolled material 10 does not slip even slightly in the width direction 2G, the rolled material 10 is
When rolling down the width, the rolled material 10 moves in the width direction 26,
The rolled material 10 may be caught obliquely in the vertical roll mill 13, or the rolled material 10 may be caught in a state where the width center line 62 of the rolled material 10 is deviated from the line center 61, which may cause arching. Lateral bending occurs in the rolled material 10.

Therefore, in the present invention, first, the position detectors 39 and 40 provided near the entry side biting part 36 of the vertical roll mill 13 are used to detect the left and right width end positions of the rolled material 1 (l) immediately before reaching the biting part 3B. 37 and 38, and also detects a width end position 4I of the rolled material 10, which is different from the above, with a position detector 42 provided at a position away from the above (on the entrance side of the side guide 21).

The detected width end positions 37, 3L41 are, on the other hand,
It is input to the guide calculation control unit 44, and the guide calculation control unit 4
4 is the width end position 37 and 41 based on the line center 61.
The amount of inclination 63 of the rolled material 10 is determined from the difference between the position detectors 39 and 42 (known in advance), etc. 10, find the direction of inclination (shifting) of the rolled material 10.
The command signal 52.53 sent to the guide body 19.20 on the biased side is corrected so that the amount of inclination 63 becomes zero, and the guide body 19.20 is moved to push the rolled material 10 from one side.

As a result, the width center line 62 of the rolled material 10 and the line center 6
1 are made parallel or coincident with each other, and the horizontal bending of the rolled material 1θ caused by oblique biting of the rolled material 10 is reduced or prevented.

Also, the width end position 37°3 detected by the position detector 39.40
8 is manually operated by the roll calculation control unit 43, and the roll calculation control unit 43 operates at the left and right width end positions 37 and 38 of the rolled material 10.
The left and right compression widths 59.60 of the rolled material 10 are determined from the difference between and the position of the rolling end point 55 of the vertical rolls 11.12, and from the left and right compression widths 59.60, the vertical rolls as shown in FIG. 11. Compression width 59,1 for each circumferential speed A, mouth, and C of 12
Based on the relationship between 30 and the average feed speed, the average feed speed of the left and right vertical rolls 11 and 12 is determined.

For example, the set circumferential speed is 47, and the compression width is 59. When fio is point 2, the average feed rate is point e.

The average feed speed is a feed speed of 57.5 which is 18 components in the feed direction of the circumferential speed 56 at each part of each vertical roll 11.12.
8, it is the average from the biting point 54 to the rolling end point 55, and the larger the compression width 59.60, the smaller the average feed rate for the rolled material 10.

Also, average feed speed and compression width 59. The amount of elongation of the rolled material IO is calculated based on the product with liO.

After calculating the average feed speed of the left and right vertical rolls 11.12 in this way, the roll calculation control unit 43 controls at least one of the vertical rolls so that the extension amount, which is the product of the left and right average feed speed and the compression width 59.80, is equal. Command signal 4 sent to rolls 11 and 12
8.49 is supplemented and the circumferential speed of the vertical roll 11.12 is changed.

For example, in FIG. 2, the set circumferential speed 47 is a line start, the compression width 59 of one vertical roll 11 is a point, and the average feed speed is determined as a point, and the compression width 60 of the other vertical roll 12 is a point. When the point is calculated as the average feed rate,
Either reduce the circumferential speed of the vertical roll 11 to line A or
Increase the circumferential speed of 2 to line C.

As a result, the left and right elongation amounts of the rolled material 10 on the left and right vertical rolls 11 and 12 become equal, and the rolled material 10 caused by the misalignment between the width center line 62 and the line center 61 of the rolled material 10 becomes equal.
Lateral bending of O is prevented.

In this way, the position detector 39 is placed on the entrance side of the vertical roll mill 13.
, 40, 42, etc. are provided to detect the condition of the rolled material lO before being rolled down in width, and based on the detected results, the occurrence of lateral bending in the part where the condition of the rolled material is detected is prevented. The width of the rolled material 10 can be rolled down without causing lateral bending over the entire length.

FIG. 3 shows another embodiment of the present invention, in which one guide body 1
Load cells 33.9 provided on the guide rollers 27.28.
The detected load 64.65 from 34 is guided by the calculation control section 44.
The detected load is 84.6 by the guide calculation control unit 44.
This embodiment is the same as the embodiment described above, except that the inclination amount 63 of the rolled material 10 is determined based on the difference of 5, and the same effects can be obtained.

It should be noted that the method for controlling lateral bending of a rolled material according to the present invention is not limited to the above-mentioned embodiments, and the embodiments shown in FIGS. 1 and 2 and the embodiment shown in FIG. 3 may be combined. It goes without saying that various other changes may be made without departing from the spirit of the present invention.

[Effects of the Invention] As explained above, according to the method for controlling lateral bending of a rolled material of the present invention, various excellent effects as described below can be achieved.

■ The condition of the rolled material before it is width-reduced on the entry side of the vertical roll mill is detected, and the rolled material is prevented from lateral bending in the area where the condition is detected, so it is possible to This makes it possible to reduce the width of the rolled material without causing lateral bending.

(2) According to the control method of the first aspect, lateral bending due to a deviation between the width center line of the rolled material and the line center is prevented.

(2) According to the control method of claim 2, horizontal bending due to oblique biting of the rolled material is prevented.

[Brief explanation of drawings]

FIG. 1 is an overall plan view showing an example of an apparatus for carrying out the method of the present invention, and FIG.
A diagram showing the relationship between the compression width 59.60 and the average feed speed for C, FIG. 3 is an overall plan view showing another example of the apparatus for carrying out the method of the present invention, and FIG. FIG. 5 is a plan view of a conventional example. In the figure, 10 is a rolled material, 11.12 is a vertical roll, 13 is a vertical roll mill, 19.20 is a guide body, 21 is a side guide, 26 is a width direction, 36 is a biting part, 37.38 is a width end position , 43 is a roll calculation control unit for equalizing the extension amount of the vertical rolls 11.12, 44 is a guide calculation control unit for moving the guide body 19.20, and 48.49 is an output from the roll calculation control unit 43. Command signal, 5B, A, mouth, C are circumferential speed, 57.58 is feed speed of vertical roll 11.12, 59.60 is compression width, 61 is line center, 62 is width center line, 63 is inclination amount show.

Claims (1)

[Claims] 1) Detecting the left and right width end positions of the rolled material near the biting part on the entry side of the rolled material of a vertical roll mill that reduces the width of the rolled material using a pair of left and right vertical rolls, and detecting the width end positions of the rolled material. Find the left and right compression widths of the rolled material, calculate the extension of the left and right vertical rolls from the obtained left and right compression widths of the rolled material, and set the length of at least one of the vertical rolls so that the extension of the left and right vertical rolls is equal. A method for controlling lateral bending of a rolled material, characterized by changing the circumferential speed. 2) Determine the amount of inclination of the rolled material on the entrance side of the vertical roll mill where the width of the rolled material is reduced by a pair of left and right vertical rolls, and adjust the pair of left and right guide bodies provided on the input side of the rolled material of the vertical roll mill based on the amount of inclination. A method for controlling lateral bending of a rolled material, comprising moving at least one guide body of a side guide in the width direction of the rolled material to make the width center line of the rolled material parallel to the line center of a vertical roll mill.