JP2000254815A - Determination of side trimmer shearing width on continuous line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue smooth trimming by executing the trimming while reducing a width by the width narrowing amount obtained by operating a set value of a plate width after the shearing, of a trailing material, when the amount of displacement is larger than the trimmer shearing tolerance in a side trimmer. SOLUTION: When the amount σ of displacement is larger than the trimmer shearing tolerance, the width narrowing amount α is operated on the basis of the amount of displacement σ. Then the conveying line is automatically stopped at a time when a welding point of a strip reaches to a trimmer position by tracking. Then the trimmer shearing width is set on a command width-α, the operation of the conveying line is restarted for restarting the trimmer operation to continuously execute the trimming. In the measurement of width, a center line of a trailing material is continuously measured, the tracking is executed again when the amount of displacement σ is returned to be less than the trimmer shearing tolerance, and the setting of the trimmer shearing width is reset on the command width at a time when a returning point of the strip reaches to the trimmer position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side trimming method for a strip material, and more particularly to a side trimming method for preventing a trimmer from being displaced even in a side trimming of a continuous line in which a strip material is joined and continuously processed. It relates to a method for setting a shear width.

[0002]

2. Description of the Related Art Generally, a strip material such as a hot-rolled steel strip or a cold-rolled steel strip is continuously cut at both ends of a sheet material by a device (side trimmer or side trimming device) for shearing an end portion in a width direction of the plate. As a result, products having a predetermined width are manufactured. For example, in a processing line for such a strip-shaped material such as a steel strip, specifically, in a continuous pickling line, a continuous annealing line, a continuous plating line, etc., a predetermined strip is continuously welded by welding steel strips having different widths. In the case of side trimming to the width, if the sheet width of the preceding material and the succeeding material are different, it is necessary to change the trimming allowance for trimming at the welded seam (called a welding point).

[0003] There is an optimum range for the trimming of the side trimming device, and if it is out of the range, the line operation is hindered. In other words, if the ear trim is too large, the load on the scrap chopper, which is a processing device for ear dust, is likely to be high and the normal operation will not be performed, and the yield will be deteriorated. On the other hand, if the trimming is too small, sufficient side trimming cannot be performed. The trimming side setting of the side trimming device can be set only so that the blades on the motor side and the operating side are symmetrical with respect to the center of the line. Scratches may occur. Further, it may not be possible to secure a predetermined product width.

[0004] Therefore, when the trimming margin is too small, the trimming must be stopped by opening the side trimmer.
In this case, it is necessary to pass through the trimming line again in the next step in order to secure a predetermined product width, which causes a significant deterioration in the basic unit. Weld misalignment between the preceding and succeeding strips is one of the major causes of the shortage of the margin. As shown in FIG. 4, if there is a bent portion 21 caused by meandering or the like at the tip of the following material 1b, the center line of the preceding material 1a
The welding is performed in a state where the deviation amount δ occurs between the center line 14b of the subsequent material 1b and the center line 14b of the following material 1b.

If side trimming is to be performed in such a state, the trimming is performed along the trimming line indicated by 13, so that the trimmer blade is disengaged at the portion of the trimmer off portion 22 near the welding point 20 and trimming becomes impossible. .
In the case of the side trimmer device, once the trimming is stopped by releasing the trimmer, the trimmer cannot be reused until the notcher provided to allow the trimmer blade to enter the strip comes next to the side trimmer. .

For this reason, the trimming for one coil cannot be normally performed entirely, and it is necessary to perform the trimming again in order to reduce the product width in the next process, so that the yield is greatly deteriorated. Also,
Conventionally, in a high-speed process line, an edge trimming abnormality is visually monitored by an operator, so that it is not enough to avoid an abnormal trouble. As a method of avoiding the ear cut due to meandering, for example, Japanese Patent Publication No. 59-40573,
A method using a side guide device as disclosed in Japanese Patent Application Laid-Open No. 1-177908 is known. However, these methods are effective for gentle meandering such as camber due to poor base plate shape of the hot rolled steel sheet, but due to sudden and local meandering like welding deviation at the welding point described above. It is impossible to prevent instantaneous ear cuts. Similarly, the meandering countermeasure using the steering roll disclosed in Japanese Patent Application Laid-Open No. 8-150510 is also completely ineffective against a sudden change such as a welding deviation at a welding point.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a continuous line capable of preventing an instantaneous edge cut off due to sudden and local meandering, such as a welding deviation at a welding point described above. The purpose of the present invention is to provide a method for setting the side trimmer shear width, which enables the trimming to be continued smoothly without causing an insufficient cutting edge even for sudden meandering around the welding point due to welding misalignment. is there.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a side line in a continuous line having a width meter for continuously measuring the width direction end position of a strip and measuring a width thereof, and a side trimmer for trimming an ear. In the method of setting the trimmer shear width, the width meter measures the center line in the width direction at the welding point of the preceding material and the succeeding material of the strip material, and determines the deviation δ between the width center line and the line center of the transport line. If the deviation amount δ is larger than the allowable amount of trimmer shear in the side trimmer, trimming is performed by reducing the set value of the post-shearing sheet width by the width narrowing amount α calculated from the deviation amount δ. And performing the trimming by returning the set value of the plate width after shearing to the original value and trimming after the deviation amount δ returns to the trimmer shear allowable amount or less. Solve I decided.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. The present invention is applied to the device shown in FIG. The apparatus shown in FIG. 2 includes a pair of upper and lower trimmer blades (round blades) 3 that can move in the width direction of the strip 1 and can be turned in a horizontal plane, and a trimming material upstream of the trimmer blades (round blades) 3. A width meter 2 for detecting an absolute position of an end portion in the width direction, a shift amount calculation controller 9 for calculating a shift amount between a center position in the width direction of the trimming material and a line center (trimmer width center) based on a signal from the width meter. , A length measuring roll 7 for measuring the amount of strip movement, a PLG 8 directly connected to the length measuring roll, and a narrowing amount α obtained by a signal from the tracking and shift amount calculation controller 9 by a signal from the PLG 8.
And a trimmer blade setting device 11 for setting the trimmer blade (round blade) 3 based on the narrow amount α set by the narrow amount arithmetic controller 10, and further comprises a trimmer blade. (Round blade) Scrap chopper 5 that cuts and processes ear dust 4 trimmed with 3
Further, a bar masher 6 for correcting the return of the edge portion of the strip material after trimming, and a shear 12 for cutting a narrow portion, which is a defective portion, based on a tracking signal are provided.

The present invention, as described with reference to FIG. 4, solves the problem of trimmer dislocation caused by insufficient cutting edge due to sudden meandering caused by welding misalignment between the preceding material and the following material of the strip. In the apparatus described with reference to FIG. 2, a side trimmer shear width described below is set. In the present invention, when the welding deviation δ is large at the welding point 20 shown in FIG. 3, the setting of the side trimmer shear width near the welding point 20 is performed based on the flow shown in FIG.

In other words, when the welding deviation δ is large, based on the calculated value of the narrow amount α performed based on the deviation δ,
At the setting position 15 of the trimmer shear width, set the trimmer blade to the narrow amount α
The trimming is performed by setting the position narrower by the minute. Then, at the trimmer shear width recovery position 16 where the bending of the following material 1b (the bent portion indicated by 21) is eliminated, the position setting of the trimmer blade is restored to the normal side trimmer shear width for the following material. The trimming is performed.

Hereinafter, the flow of FIG. 1 will be described in detail. The side trimmer shear width setting process of the present invention starts at the timing when the welding point has passed through the width gauge (100). First, continuous measurement (110) of the end positions at both ends in the width direction of the leading portion of the following material is performed using a width meter, and the center line of the following material is measured. Then, the shift amount δ between the center line of the succeeding material and the line center of the transport line is calculated (120), and it is determined whether the shift amount δ is larger than the allowable trimmer shearing amount (130).

When the deviation δ is smaller than the allowable amount of trimmer shearing, the trimmer does not deviate, so that the processing of the present invention is terminated, and thereafter only normal processing is performed. on the other hand,
If the shift amount δ is larger than the allowable amount of the trimmer shear, the trimmer will be shifted as it is, so the following processing of the present invention is performed. First, from the deviation amount δ, the narrow amount α
Is calculated (140). Although the detailed description of the calculation of the narrowing amount α is omitted, the calculation is performed so that the trimming portion 22 does not occur as shown in FIG.

Next, when the welding point of the strip reaches the trimmer position by tracking (150), the transport line is automatically stopped (160). Then, the trimmer shear width is set to (command width-α) (170), the transport line operation is resumed (180), and the trimmer operation is resumed to continue the trimming. The width meter continuously measures the center line of the succeeding material. When the deviation amount δ returns to the allowable amount of the trimmer shear (190), tracking is performed again, and the return point (δ At a point (200 points or less) at the trimmer position, the trimmer shear width setting is reset to the command width (210), and a series of processing of the present invention is completed. Here, when resetting the trimmer shear width setting to the command width, it is not necessary to stop the line, and the resetting can be performed while trimming.

[0015]

EXAMPLE When the conventional side trimmer shear width setting method was used, the trimmer slippage caused by the welding slippage between the preceding and succeeding strips was about 10 times / month (approx. %), Which was a major cause of line trouble. However, after employing the method for setting the shear width of the side trimmer of the present invention, the trimmer could not be displaced at all.

[0016]

According to the present invention, trimming can be smoothly continued without shortage of the edge cut-off even when the meandering before and after the welding point due to the welding deviation of the strips having different widths is performed. , Line availability,
It has become possible to greatly contribute to improving yield.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a method for setting a side trimmer shear width according to the present invention.

FIG. 2 is a plan view of a continuous line to which the method for setting a side trimmer shear width according to the present invention is applied.

FIG. 3 is a conceptual plan view illustrating a method for setting a shear width of a side trimmer according to the present invention.

FIG. 4 is a conceptual plan view for explaining a joining shift at a welding point of the strip.

[Explanation of symbols]

 Reference Signs List 1 strip material 1a preceding material 1b trailing material 2 (online) width gauge 3 trimmer blade 4 ear scraps 5 scrap chopper 6 bar masher 7 measuring roll 8 PLG (pulse generator) 9 displacement calculation controller 10 narrow width calculation controller 11 trimmer blade Setting device 12 Shear 13 Trimming line 14 Center line 15 Trimmer shear width narrow setting position 16 Trimmer shear width recovery position 20 Weld point 21 Bend (at the end of strip) 22 Trimmer off

Claims (1)

[Claims] 1. A method for setting a side trimmer shear width in a continuous line having a width meter for continuously measuring an end position in a width direction of a band-shaped material to measure a width and a side trimmer for trimming an ear portion. The width meter measures the center line in the width direction at the welding point of the preceding material and the succeeding material of the strip material, and calculates the deviation δ between the center line in the width direction and the line center of the conveyance line, and calculates the deviation δ Is larger than the allowable trimmer shearing amount in the side trimmer, trimming is performed by reducing the set value of the post-shearing plate width after shearing by the width narrowing amount α calculated from the deviation amount δ, and the deviation amount δ A method for setting a side trimmer shear width in a continuous line, wherein the trimming is performed by returning the set value of the plate width after shearing to the original value and then performing trimming after returning to a value equal to or less than the allowable shear amount.