JPS61150719A - Operating method of tension leveller - Google Patents

Abstract

PURPOSE:To obtain good steel strip products with eliminating the unstabilized straightening part generated on a strip steel at the operation starting and finishing times by giving to a leveller roll the specified state of rolling reduction at the operation starting and finishing times. CONSTITUTION:The operation is executed by arranging a deflector roll 3 on the outlet side of leveller roll group 2, speed detector 4, the intermesh setters 9, 10, 11, 12 to perform position setting and the arithmetic unit 13 to set up the intermesh of each leveller roll 5, 6, 7, 8 according to the movement of the strip steel with operating the strip steels position by speed detecting signal. At the operation starting time of the tension leveller, the rolling reduction is applied by bringing into contact with the strip steel the rolls in order from the leveller roll 5 of the inlet side by setting to the passing through the prescribed position of the strip steel and at the completion time the rolls are released in order from the strip steel from the leveller roller of the inlet side by setting to the passing through the prescribed position of the strip steel. The camber and shape change at the starting and finishing times of tension levelling are thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of operating a tension leveler.

(Prior art) The operation of a conventional tension leveler is as follows: (A) The line is started with all the leveler rolls of several units rolled down on the steel strip at the same time, and when the operation is finished, the line is stopped with the rolls rolled down on the steel strip. An operating method in which the leveler is opened, and (B) an operating method in which all the leveler roll groups are quickly opened and quickly closed simultaneously during low-speed (approximately 30 mpmi) line operation have been applied.

In the case of the operation method (4) above, the steel strip in the leveler at the start of operation and the steel strip in the leveler at the end of operation are:
As shown in FIG.
There was a coexistence of the part A) and the unstable part (B), which was corrected by a group of leveler rolls of (n 1) or less.

Even in the case of the operation method (B) above, if we take the moment of closing and the moment of opening, we get the result shown in Figure 3 (a).

(A phenomenon similar to the case shown in bl has occurred, and the steel strip that was in the tension leveler at the time of claw and opening has an unstable straightening part (b), and the shape, especially the warp, This is an undesirable occurrence.

In Figure D 2: Tension leveler roll group, 20:
Straightening section by all rolls #1 to #n, 21: #
Correction part with two wires, n and # row 1, 22: # n
23: Corrected portion by only #1; 25: Corrected portion by #1 only; 26: Corrected portion by #1 and #2.

(Problems to be Solved by the Invention) The present invention is a tension leveler that solves all of the conventional problems and obtains a steel strip with excellent flatness at the tip, rear end, and leveler stop of the steel strip, and especially with less warpage. This provides a driving method.

(Means for Solving All Problems) The present invention, when straightening the entire shape of a steel strip by passing it through a tension leveler, the shape is only achieved after passing through all of the plurality of leveler rolls, and only partially. The assumption is that if a leveler roll is passed through the entire surface, the shape will become unstable and undesirable.

In particular, at the start of operation and at the end of operation, the steel strip in the tension leveler is partially passed through the leveler roll.
This results in a defective shape, but conventionally there was no method for completely correcting the defective shape, and the present invention completely eliminates this problem.

That is, in the present invention, the straightening conditions of the tension leveler are made appropriate according to the movement of the steel strip so that there will be no shape defects such as warpage at the start and end of the tension leveler operation.

Next, the present invention will be explained in detail with reference to FIGS.

When starting the tension leveler operation, all the leveler rolls are left open, and after the steel strip passes a predetermined position (
For example, just before or after the welding part with the preceding coil, the first leveler roll counted from the inlet side is brought into contact with the steel strip, a predetermined amount of intermesh is applied, and the steel strip is moved downstream, leveler roll #1 is brought into contact with the steel strip. The correction start part A is
When the strip reaches directly below the leveler roll #2, a predetermined amount of intermesh is applied to the leveler roll #2, and then by moving the strip downstream, the straightening start part A by the leveler roll #1 reaches the leveler roll #3 directly below. At that time, apply a predetermined amount of intermesh to the repeller roll #3. Furthermore, this method is followed in order by the final leveler roll (#n
), and a predetermined amount of intermesh gold from all the leveler roll groups is added to the strips starting from the first leveler starting point.

On the other hand, when terminating the operation of the tension leveler, all the leveler rolls are in the clamped operating state, and before passing a predetermined position (for example, just before passing the weld with the trailing coil), open the first grain on the inlet side and move the strip downstream. As a result, RB at the coil position where leveler roll #1 is open,
When reaching leveler roll non-2, leveler roll #2 is fully opened. This is an operating method in which the repeller rolls are sequentially opened up to the later stages. However, in the above operating method, if the tension in the tension leveler is controlled to be constant, the warpage will be further reduced and the shape will be stabilized.

The operating method of the present invention is effective at the start and end of operation of the tension leveler, that is, in other words, at the positions corresponding to the tip and rear ends of the coil. It is applied from time to time.

Next, an example of an apparatus for carrying out the present invention will be explained with reference to FIG.

A deflector roll 3 provided on the exit side of a leveler roll group 2 provided for leveling the steel strip 1, its speed detector 4, and an interface for setting the position of the leveler rolls 5, 6, 7, and 8. 9, 10, 11.1
Install 2'2. However, by installing a calculation device 13 that calculates the steel strip position jl tracking using the speed detector signal and sets the intermesh of each leveler roll 5, 6° 7.8 according to the movement of the strip, this can be achieved. It is possible to carry out the operation of the invention.

(Effects of the Invention) As described above, according to the method of operating a tension leveler according to the present invention, warping and shape changes at the start and end of tension leveling can be completely prevented, and the yield can be improved. and is extremely advantageous.

[Brief explanation of drawings]

1(a) and 1(b) are explanatory diagrams of a tension leveler according to the present invention - an operating method at the time of starting and stopping the operation, FIG. 2 is a block diagram showing one device configuration of the present invention, and FIG. 3(a)
l, (bl is an explanatory diagram showing the relationship between the roll state and warpage at the start and end of operation in the conventional method. Setting device Fig. 3 (C1) Part 1 - 4 - Part A Fig. 3 (b) Fig. 1 (α) A

Claims (1)

[Claims] At the start of operation of the tension leveler, as the steel strip passes through a predetermined position, the leveler rolls are sequentially brought into contact with the steel strip from the leveler roll on the entry side to the leveler roll on the exit side to apply rolling and/or operate the tension leveler. At the end,
A method for operating a tension leveler, characterized in that the leveler rolls are sequentially released from the steel strip from the leveler roll on the entry side to the leveler roll on the exit side as the steel strip passes through a predetermined position.