JPH10277780A - Strip welding method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a continuous strip steel processing line, when welding the rear end of a preceding strip and the front end of a following strip, the centers of both strips are made to coincide with each other to prevent the occurrence of width deviation. Reduce. SOLUTION: At a downstream side and an upstream side of a welding machine 3, a predetermined interval is provided in a longitudinal direction of a leading strip 1 and a trailing strip 2 in a longitudinal direction,
A plurality of pairs of position detection sensors 4a, 4b, 5a, 5b provided on both sides sandwiching both steel strips measured each center of the preceding steel strip 1 and the following steel strip 2 at each position. From the centers of both steel strips, the centers of the leading steel strip 1 and the following steel strip 2 at the welding position are extrapolated and estimated, and the welding positions at the welding positions are adjusted so that the centers of both steel strips at the estimated welding position match. The width direction positions of the leading strip 1 and the trailing strip 2 are adjusted by the side guides 6a, 6b, 7a, 7b provided on the downstream side and the upstream side, and then both the strips are welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous processing line such as a pickling line, a cold rolling line, and an annealing line for strip steel, in which a rear end of a preceding steel strip and a front end of a following steel strip are connected to both strips. The present invention relates to a method of welding a steel strip in which the center positions of the steel are made to coincide with each other and welded.

[0002]

2. Description of the Related Art In a continuous processing line such as a pickling line, a cold rolling line, and an annealing line of a strip steel, it is necessary to accurately weld a rear end of a preceding strip steel and a front end of a subsequent strip steel line. It is important for continuous operation, efficiency improvement, and yield improvement. In particular, minimizing the width deviation during welding greatly contributes to the reduction of line troubles and the improvement of yield and work efficiency.

For this purpose, it is necessary to match the center of the leading strip and the center of the succeeding strip at the welding position. However, it is necessary to directly detect the centers of both strips at the welding position and adjust the center position. Because a welding machine and other auxiliary equipment are installed at the welding position, it is difficult to install the equipment.Conventionally, the leading steel strip and the succeeding steel strip are sandwiched by a single side guide, and the center of the steel strip is And the center of the side guide were forcibly matched to correct the gap between them.

[0004]

However, in the above-mentioned conventional method of aligning the center of the steel strip with the center of the side guide at the position of the side guide, the strip steel center at the side guide position and the welding position are both mechanically mounted. It is premised that they coincide with the steel center, and if there is a bend or skew in the steel strip, the steel strip center at the welding position cannot be matched.

[0005] Further, it is difficult to install a device for directly detecting the center of the steel strip at the welding position due to facility restrictions.
The problem that cost becomes high arises. Accordingly, an object of the present invention is to solve the above-mentioned problems, and to align the centers of both steel strips in welding a rear end of a preceding steel strip and a front end of a following steel strip in a continuous steel strip processing line. Another object of the present invention is to provide a method for welding a steel strip, which can reduce the occurrence of width deviation.

[0006]

SUMMARY OF THE INVENTION The method of the present invention, when welding the rear end of a preceding steel strip and the front end of a following steel strip in a continuous strip steel processing line, is performed in the vicinity of the welding position downstream and upstream. On the side, at a predetermined interval in the length direction of the preceding strip and the following strip, a plurality of pairs of position detection sensors provided on both sides sandwiching the preceding strip and the following strip, the plurality of pairs, Detecting the centers of the leading strip and the trailing strip at each position of the pair of sensors, and thus detecting the center of the leading strip and the trailing strip at each position of the plurality of pairs of position detecting sensors. Extrapolate the center of the leading and trailing steel strips at the welding position from the center of the running steel strip and extrapolate them.The downstream of the welding position is determined so that the centers of both steel strips at the estimated welding position match. Side and upstream A plurality of side guides provided on both sides sandwiching the steel strip, to adjust the widthwise position of said preceding steel strip and the trailing steel strip, and then, and it has the characteristics to be welded.

[0007]

Next, the method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view showing the vicinity of a welding device in a continuous pickling line showing one embodiment of the method of the present invention. As shown in FIG. 1, at a downstream side in the vicinity of the position of the welding machine 3, a predetermined interval is provided in the longitudinal direction of the leading strip 1, and two pairs of leading strip positions are detected on both sides of the leading strip 1. Sensors 4a, 4a 'and 4b, 4b' are provided, and a predetermined interval is provided in the longitudinal direction of the following strip 2 at the upstream side near the position of the welding machine 3, Pairs of trailing steel strip position detecting sensors 5a, 5a '
And 5b, 5b '.

Sensors 4a and 4a 'for detecting the position of the preceding steel strip
And 4b, 4b ', on both sides of the leading strip 1, the leading strip side guides 6a, 6a' and 6b, which allow the strip to be fixed and move in the width direction in a fixed state. 6b 'is provided, and the strip is similarly fixed and fixed on both sides sandwiching the following strip 2 in the vicinity of the sensors 5a, 5a' and 5b, 5b 'for detecting the position of the subsequent strip. There are provided side guides 7a, 7a 'and 7b, 7b' for the succeeding strip steel, which can be moved in the width direction by.

Each of the above-mentioned side guides is constituted by a hydraulic cylinder having a built-in Apsocoder capable of recognizing a mechanical position, and can operate independently.

After the preceding steel strip 1 is fixed at a predetermined position on the downstream side of the welding machine 3 by two pairs of side guides 6a, 6a 'and 6b, 6b' provided near the welding machine 3,
Two pairs of position detecting sensors 4a, 4a 'and 4b, 4
The center of the preceding strip 1 at each position, that is, at two positions, is detected by b '. Then, from the center of the preceding strip 1 at each of the detected positions, the welding machine 3
The center of the preceding steel strip 1 at the position of is extrapolated and estimated.

Similarly, after the trailing steel strip 2 is fixed at a predetermined position on the upstream side of the welding machine 3 by two pairs of side guides 7a, 7a 'and 7b, 7b' provided near the welding machine 3, the following steps are performed. The pair of position detecting sensors 5a, 5a 'and 5b, 5b' detect the center of the succeeding strip 2 at that position, that is, at two positions. Then, the center of the succeeding strip 2 at the position of the welding machine 3 is extrapolated from the detected center of the succeeding strip 2 at each of the above-mentioned positions and estimated.

[0012] The difference between the extrapolation center of the preceding steel strip 1 and the extrapolation center of the succeeding steel strip 2 at the welding position estimated in this way is calculated, and the side fixing the preceding steel strip 1 is calculated. The guides 6a, 6a 'and 6b, 6b' are operated to move the leading strip 1 in the width direction such that the extrapolation center of the leading strip 1 coincides with the extrapolation center of the trailing strip 2. Next, the rear end of the preceding strip 1 and the front end of the following strip 2 are welded by the welding machine 3. Thus, the rear end of the preceding steel strip and the front end of the following steel strip are welded without any width deviation.

The number of sensors for detecting the position of the preceding steel strip and the position of the following steel strip are not limited to two pairs, and two or more pairs of sensors may be provided.

[0014]

Next, the present invention will be further described with reference to examples. [Example 1] Plate thickness 1.2 to 6.0 mm, plate width 600 to 1
600 mm, wherein the thick steel strip has a thickness difference within 1.5 times that of the thin steel strip and the width difference is ± 300 mm
FIG. 2 shows the distribution of the width deviation when the leading strip steel and the following strip steel, which are within the range, were welded by the method of the present invention and the conventional method. The N number of welding was 300 times. As is apparent from FIG. 2, according to the method of the present invention, the occurrence of the width shift can be greatly reduced.

[Example 2] Two strip steel coil joining materials (2
Plate thickness 1.2 to 6.0 mm, plate width 6
Table 1 shows the number of times the leading strip steel and the succeeding strip steel having the same conditions as described above were welded by the method of the present invention and the conventional method with a width of 00 to 1600 mm. In addition, a sheet thickness of 1.7 to 1.7
When the leading strip steel and the succeeding strip steel having the same conditions as those described above with a width of 4.5 mm and a plate width of 600 to 1300 mm were welded by the method of the present invention and the conventional method, the outgoing side cut ratio at the joint was examined. 1 is shown.

[0016]

[Table 1]

As is apparent from Table 1, according to the method of the present invention, the number of times of trim detachment due to width deviation and the outgoing side cut ratio can be greatly reduced.

[0018]

As described above, according to the method of the present invention, when welding the rear end of the preceding strip and the front end of the following strip in the continuous strip steel processing line, the center of both strips is welded. And the occurrence of a width shift can be prevented, and industrially useful effects such as a significant reduction in the number of trim dislocations and the output side cut rate due to the width shift are brought about.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing the vicinity of a welding device in a continuous pickling line, showing one embodiment of the method of the present invention.

FIG. 2 is a graph showing a ratio of a width shift amount between the method of the present invention and the conventional method.

[Explanation of symbols]

 1 Leading strip 2 Trailing strip 3 Welding machine 4a, 4a ', 4b, 4b' Sensor for detecting leading strip 5a, 5a ', 5b, 5b' Sensor for detecting trailing strip 6a, 6a ', 6b, 6b 'Side guide for leading strip 7a, 7a', 7b, 7b 'Side guide for trailing strip

Claims (1)

[Claims] In a continuous strip steel processing line, when welding a rear end of a preceding strip and a front end of a following strip, the preceding strip and the following strip are located near and downstream of a welding position. A plurality of pairs of position detecting sensors provided at both sides of the leading strip and the trailing strip at predetermined intervals in the longitudinal direction of the strip, and the leading strip at each position of the plurality of pairs of sensors. Detecting the center of the steel and the following steel strip, and detecting the welding position from the center of the preceding steel strip and the center of the following steel strip at each position of the plurality of pairs of position detecting sensors thus detected. Extrapolate the centers of the leading and trailing strips in the above, and sandwich the strips near the welding position downstream and upstream so that the centers of both strips at the estimated welding position match. Provided on both sides The number of side guides, and adjusting the widthwise position of said preceding steel strip and the trailing steel strip, then characterized by welding, the welding method of the strip.