JP3405116B2 - Strip welding method - Google Patents

Description

Description: 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 a strip steel, and to a rear end and a rear end of the preceding strip. The present invention relates to a method for welding a strip of steel in which the ends of both strips are welded while the center positions of both strips are matched. [0002] In a continuous processing line such as a pickling line, a cold rolling line, and an annealing line of a strip steel, the rear end of the preceding strip and the front end of the succeeding strip are accurately welded. Is important for continuous operation of the line, improvement of efficiency, improvement of yield, and the like. 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. However, at the position of the side guide, the above-described conventional method of matching the center of the strip with the center of the side guide is based on the strip center at the side guide position and the welding position. Are premised on matching the mechanical center. If the steel strip has a bend or skew, 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] The method of the present invention, when welding the rear end of the preceding steel strip and the front end of the following steel strip in the continuous strip steel processing line, downstream near the welding position. On the side and the upstream side, each center of the leading strip and the trailing strip at that position is detected by position detection sensors provided on both sides of the leading strip and the trailing strip, and then the leading and trailing strips are detected. The strip steel and the following steel strip are moved by a predetermined distance in the longitudinal direction, and the respective centers of the preceding steel strip and the following steel strip at the moving position are detected by the position detection sensor, and thus, Extrapolated by extrapolating the center of the leading strip and the trailing strip at the welding position, from the center at each position in the longitudinal direction of the leading strip and the trailing strip, detected by the position detection sensor, A plurality of side guides provided on both sides sandwiching the strip on the downstream and upstream sides near the welding position so that the centers of both the strips at the estimated welding position coincide with each other. It is characterized by adjusting the width direction position of the row steel and then welding. 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 ', adjacent to the preceding steel strip 1, on both sides of which the steel strip 1 is fixed. 6b 'is provided, and the strips are also fixed and fixed on both sides of the trailing strip 2 adjacent to the sensors 5a, 5a' and 5b, 5b 'for detecting the position of the following 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. [0010] The leading 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, and then two pairs of guides are provided. Position detecting sensors 4a, 4a 'and 4
The center of the preceding strip 1 at that position is detected by b, 4b '. Next, the leading steel strip 1 is moved by a slight predetermined distance in the longitudinal direction, and at the moving position,
After being fixed by the side guides 6a, 6a 'and 6b, 6b', the center of the preceding strip 1 at the moving position is repeatedly detected by two pairs of position detecting sensors 4a, 4a 'and 4b, 4b'. The center of the detected strip 1 at the predetermined position and the moving position on the downstream side of the welding machine, that is, the length of the strip 1 by the two pairs of position detection sensors 4a, 4a 'and 4b, 4b'. The center of the preceding strip 1 at the position of the welding machine 3 is extrapolated from the four centers in the vertical direction and estimated. Similarly, after the succeeding strip steel 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. By the two pairs of position detecting sensors 5a, 5a 'and 5b, 5b'
Detect the center of Next, the succeeding strip steel 2 is moved by a slight predetermined distance in the longitudinal direction, and at the moving position,
After being fixed by the side guides 6a, 6a 'and 6b, 6b', the center of the succeeding strip 2 at the moving position is repeatedly detected by two pairs of position detecting sensors 5a, 5a 'and 5b, 5b'. The center of the detected strip steel 2 at the predetermined position and the movement position on the upstream side of the welding machine, that is, the set of the following strip steel 1 by the two pairs of position detection sensors 5a, 5a 'and 5b, 5b'. The center of the succeeding strip 1 at the position of the welding machine 3 is extrapolated from the four centers in the length direction and estimated. The estimated 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 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. According to the present invention, as described above, the centers of the two steel strips at the position of the welding machine 3 are extrapolated from the centers at several points in the longitudinal direction of the preceding steel strip 1 and the following steel strip 2. As a result, the center estimate of both steel strips at the position of the welder is a very accurate value that takes into account the bending that has occurred in the steel strip. In order to detect the center of the leading strip and the trailing strip at several positions in the longitudinal direction, the distance moved from the predetermined position in the longitudinal direction may be arbitrary, for example, 5 mm.
It is about 0 to 200 mm. In the method shown in FIG. 1, the position detecting sensor is provided at a predetermined interval in the longitudinal direction of the steel strip.
The pair was provided, and the center detection of the steel strip was performed at a predetermined position and a position moved once in the length direction from the predetermined position. However, the method of the present invention is not limited to this.
For example, a pair of position detection sensors may be provided, and the center detection of the steel strip may be performed at a predetermined position and at a position moved twice from the predetermined position in the length direction of the steel strip. 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, the thick steel strip has a thickness difference within 1.5 times that of the thin steel strip and a width difference of ± 300 mm.
The width deviation distribution when the leading steel strip and the following steel strip, which are within the range, were welded by the method of the present invention and the conventional method shown in FIG. The N number of welding was 300 times. As apparent from FIG. 2, according to the method of the present invention,
The occurrence of width deviation was able to be greatly reduced. [Embodiment 2] Two strip steel coil joining materials (2
Plate thickness 1.2 to 6.0 mm, plate width 6
When the preceding strip steel and the following strip steel having the same condition as described above and having a length of 00 to 1600 mm were welded by the method of the present invention and the conventional method shown in FIG. . Further, a leading steel strip and a succeeding steel strip having a thickness of 1.7 to 4.5 mm and a width of 600 to 1300 mm, which are also made of a two-contact indicator, and have the same conditions as those described above, are subjected to the method of the invention shown in FIG. In addition, the output side cut ratio at the joint portion when welding was performed by the conventional method was examined. [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. 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 succeeding strip in the continuous strip steel processing line, the two strips are welded. The center of the steel is matched to prevent the occurrence of a width shift, and industrially useful effects such as the number of trim detachments and the exit side cut rate due to the width shift are greatly reduced.

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. [Description of Signs] 1 Leading band 2 Trailing band 3 Welding machine 4a, 4a ', 4b, 4b' Leading band position detecting sensor 5a, 5a ', 5b, 5b' Trailing band steel position detecting sensor 6a, 6a ', 6b, 6b' Side guide for leading strip 7a, 7a ', 7b, 7b' Side guide for trailing strip

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-96398 (JP, A) JP-A 61-132269 (JP, A) JP-A 50-121143 (JP, A) (58) Investigation Field (Int. Cl. ⁷ , DB name) B23K 37/04 B21B 15/00

Claims (1)

(57) [Claims 1] In a continuous strip steel processing line, when welding the rear end of a preceding strip and the front end of a following strip, downstream and upstream near a welding position. The center of the leading strip and the trailing strip at that position are detected by the position detection sensors provided on both sides of the leading strip and the trailing strip, respectively. The traveling steel strip is moved by a predetermined distance in the longitudinal direction, and each center of the preceding steel strip and the following steel strip at the moving position is detected by the position detection sensor. Extrapolating the centers of the leading and trailing strips at the welding position from the centers at the respective longitudinal positions of the leading and trailing strips detected by the sensor and estimating the estimated welding positions In A plurality of side guides provided on both sides sandwiching the strip near the welding position so that the centers of both strips coincide with each other. A method for welding a steel strip, comprising adjusting a directional position and then welding.