JPS60102217A - Method and apparatus for plate width control in vertical rolling mill - Google Patents

Abstract

PURPOSE:To minimize variation of plate width at the tip of a slab and to improve dimensional accuracy of width of products by replenishing pressure liquid by the quantity to which the liquid in the screw down cylinder is compressed at the time of slab biting. CONSTITUTION:A tip position signal of a slab S detected by a tip position detector 4 and a speed signal of the slab S detected by a speed detector 5 are sent to a logical circuit 11, and number of seconds after which the tip of the slab S arrives at outer periphery of the vertical roll 1 is calculated. Time obtained by the logical circuit 11 is sent to an AND circuit 12. On the other hand, when the slab S is sent to the vertical roll 1 and bitten in, a signal detected by an accelerometer 6 is sent to the AND circuit 12. When the signal is inputted to the AND circuit 12 from the logical circuit 11 and accelerometer 6, a command signal is outputted to a servo valve 8, and pressure liquid is replenished to the screw down cylinder 3 from conduits 9, 10. When pressure liquid is replenished to the screw down cylinder 3, a gap is fastened for a specified time, and accuracy of tip width of the slab S is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for rolling down a slab in width.
This article relates to a strip width control method in a vertical rolling mill and an apparatus therefor that can improve the width accuracy of the strip.

When the slab goes up to the vertical rolling mill and is rolled down in width, the gap between the left and right vertical rolls is set to a predetermined interval, and when the tip of the slab is bitten between the vertical rolls, the rolling device rolls the slab through the vertical rolls to the specified width. When width reduction is performed by applying a reduction blade, as shown in Figure 1, due to the sinking of the reduction cylinder when the slab is biting, a plate width change part (al) is generated at the tip of the slab (S). Even if width reduction is performed by making the gear knob between the vertical rolls smaller than the predetermined size by the amount equivalent to the depression of the tone cylinder (initial gear knob) in order to reduce the width change part (α) a little, the second As shown in the figure, a plate width changing portion (a') is formed at the tip of slab I8).

The present invention was made with the aim of improving the accuracy of the plate J layer at the tip of the slab by minimizing the change in plate width that occurs at the tip of the slab. The reduction cylinder is replenished with liquid in proportion to the amount of liquid in the reduction cylinder being compressed.

Hereinafter, an example of the "misfire" will be described with reference to the drawings.

In Figures 6 to 5, (1) is a vertical roll, (2) is a vertical roll shaft box that rotatably supports the vertical roll (1), and (3) is a rolling sill that rolls down the width of the slab (8). -1 (4) is a tip position detector such as a noto cell that detects the tip position of the slab (s), (5) is a speed detector that detects the speed of the slab (8), (6) (d slab (8) The tip of the head is a vertical roll (
1) An accelerometer that detects when something is caught between (1)
7) is a load detector that detects the reduction blade, (8) is a servo valve, and (9) αO is a pipe line that feeds pressure liquid from the servo valve (8) to the reduction cylinder (3). Position detector (4
) and the speed position detector (5) can be sent to the logic circuit (1]).
The output from 1) and the signal detected by the accelerometer (6) can be sent to the AND circuit θ'2. In addition, the output signal from the AND circuit 0 (2) and r”r overlap detection 3ty
The signal detected in (7) is sent to the arithmetic and control unit 0;
The arithmetic and control unit 03 can issue commands to the servo valve (8).The tip position detector (4) detects the tip of the slab (s). The position signal and the speed signal of the slab (s) detected by the speed detector (5) are sent to the logic circuit (], 1): ? t
The logic circuit 01) determines how many seconds it will take for the tip of the slab (8) to reach the outer periphery of the vertical line (1).

The distance from the tip position detector (4) to the center of the vertical roll (1) is l, and the radius of the vertical roll (1) is 1(,
1lVli ll-1: reach is ΔW, the contact angle is θ, the speed of the slab (sl) is V, the distance from the slab (sl tip to the vertical roll (1) outer periphery 1 in contact with the tip of the slab (sl) is j1 Let T' sec be the time it takes for Surano' (S) to move by distance l' after the tip position is detected, then #: (l R51nθ - (ii)'r' = 1
'/V' -.-(ilil), and since θ and T' are determined by the slab whose width is to be rolled down, T' is calculated from formula fiii).

The time T' determined by the logic circuit 0 is sent to the AND circuit 02, and on the other hand, when the slab (sl) is fed to the vertical roll (1) and bitten 1, the signal detected by the accelerometer (6) is It is sent to the AND circuit θ9, and the logic circuit (■υ and accelerometer (6)
When a signal is manually input to the AND circuit @, a command signal is output from the AND circuit (2) to the servo valve (8), and the pressure fluid is transferred from the pipe (9) αO) to the reduction cylinder (3). will be replenished. The amount of replenishment of the pressurized liquid is such that the liquid in the compression cylinder (3) is compressed when the slab (8) is bitten. Also, the time to replenish pressure fluid to the pressure reduction cylinder (3) is determined by the slab (
8) Set the time at which the plate width error at the tip is the minimum, and determine this time in advance by testing. When the pressure fluid is replenished into the reduction cylinder (3), the gear saw is tightened for a predetermined period of time, so that the width accuracy of the tip end of the slab (8) is improved.

In addition, in the embodiment of the present invention, the command to replenish the pressure fluid to the compression cylinder, slab formation W;l'1: [! :'
- A predetermined time has passed after position detection, and force ++ velocity, jl yo Q
Regarding the case where a signal is output/will be performed 1. ), but without using an accelerometer, the tip of the slab could be set at 1 ga f&/
Of course, it can be implemented by issuing a command to replenish the pressure fluid after a certain period of time has elapsed, and other additions to the history of the gods within the scope of the gist of the present invention (E);'L, etc. .

The plate width for the vertical rolling mill of the present invention is 11i11 fili
l,',)Ji), and according to the device, a pressure-ton' cylinder of liquid is retained in the slab-engaging rib)(
Pressure fluid is replenished into the linder, which minimizes changes in the plate width at the tip of the slab, improves the width dimension accuracy of the product, and improves quality. You can also enjoy the excellent effects of bamboo shoots.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the slab shape when the width of f11''1 is first reduced without any correction, and Figure 2 is an explanatory diagram of the slab shape when the width of f11''1 is reduced without making any corrections. An explanatory diagram of the slab shape when the tightening width is reduced, Figure 6~
FIG. 5 is an explanatory diagram of the strip width control method and device for a vertical rolling mill according to the present invention, FIG. 6 is an explanatory diagram of an apparatus for carrying out the method of the present invention, and FIG. 4 is an explanatory diagram of the apparatus shown in FIG. 6. FIG. 5 is a plan view of FIG. 4. In the figure, (1) is a vertical roll, (3) is a reduction cylinder, and (4) is a vertical roll.
) is a tip position detector, (5) is a speed detector, (6) is an accelerometer, (8) is a servo valve, αη is a logic circuit, and @ is an AND circuit. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 1 Figure 2 Figure 3 @ Figure 4 Y-・ Figure 5

Claims (1)

[Scope of Claims] 1) A vertical rolling mill characterized in that when the slab tip is bitten, a reduction cylinder is replenished with pressure oil equal to the amount of compression of the pressure liquid in the reduction cylinder to reduce the width of the slab tip. Plate width control method. 2) A tip position detector detects the tip position of the slab, a speed detector detects the speed of the slab sent to the vertical rolling mill, and the signals detected by the tip position detector and speed detector indicate that the tip of the slab is A device that calculates the time until the vertical roll comes into contact with the outer periphery, and a device that supplies pressurized liquid to the reduction cylinder after the elapse of the calculated time by the amount of compressed liquid in the reduction cylinder when the plate is bitten. A strip width control device for a vertical rolling mill, characterized by: