JP2915551B2 - Steel tail position control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for controlling a position of a tail end of a steel sheet in a continuous steel sheet processing facility.

[Prior art] In the sheet manufacturing line, when the unwinding of the pay-off reel coil is completed, the starting end (tip) of the next steel sheet is welded to the end (tail end) of the steel sheet, and the steel sheet is continuously connected to a rolling mill or the like. Will be sent.

For example, as shown in FIG. 3, the preceding steel plate 2a is controlled to be centered by a CPC (center position control) device 52 downstream of the bridle roll 40 and a CPC device 12 for the payoff reel 11. That is, on the downstream side of the welding machine 31, the center position of the traveling steel plate 2a is detected by the position sensor 53, and based on this position information, the positional deviation (deviation) of the traveling steel plate 2a from the central position of the feed line is grasped. In response, the roll 51 is moved by the CPC device 52, and the centering control is performed so that the center of the steel plate 2a runs in the center of the feed line. Further, on the upstream side of the welding machine 31, the center position of the traveling steel plate 2a is detected by the position sensor 13, and a deviation from the feed line central position of the traveling steel plate 2a is grasped based on this position information,
The payoff reel 11 is moved by the CPC device 12 according to the deviation, and the centering control is performed so that the center of the steel plate 2a runs in the center of the feed line.

On the other hand, the trailing steel plate 2b is a CPC for another payoff reel 21.
Centering control is performed by the device 22. That is, the center sensor detects the center position of the leading end of the following steel plate 2b by the position sensor 23, grasps the deviation from the center position of the feed line of the steel plate 2b based on this position information, and according to the deviation, the payoff reel 21 And the centering control is performed so that the center of the steel plate 2b runs in the center of the feed line.

In the welding machine 31, the tail end of the preceding steel plate 2a and the front end of the succeeding steel plate 2b are aligned with each other in the following procedures, and the two are welded.

The center position of the tail end of the preceding steel plate 2a is detected by the position sensor 34 on the outlet side of the welding machine.

The center position of the leading end of the succeeding steel plate 2b is detected by the position sensor 35 on the inlet side of the welding machine.

The deviation between the center of the tail end of the preceding steel plate 2a and the center of the front end of the following steel plate 2b is calculated.

Shift the leading end of the trailing steel plate 2b by the deviation
Is centered on the center of the tail end of the preceding steel plate 2a, and this is welded.

The relationship between the preceding steel plate and the following steel plate is such that the payoff reels 11 and 21, the position sensors 13 and 23, and the CPC devices 12 and 22 are alternately used.

[Problems to be Solved by the Invention] However, in the conventional position control method, when the leading end of the succeeding steel plate 2b is shifted so that the centers of the end surfaces of the plates coincide with each other, and welding is performed, as shown in FIG. Wire 3 is a steel plate
It is skewed with respect to the center line of 2a, 2b, so-called "U-shaped welding"
Occurs. This is because the leading steel plate 2a does not always pass through the center of the feed line at the position of the welding machine 31,
The deviation between the center of the tail end of 2a and the center of the tip of the succeeding steel plate 2B increases, and the center line of the preceding steel plate 2a and the center line of the following steel plate 2b are not aligned. When the "curvature welding" occurs, the steel sheet cannot be correctly passed through the center of the feed line, which causes various inconveniences. In addition, it has a significant effect on the subsequent surface treatment process, leading to a reduction in the quality of the steel sheet.

The present invention has been made in view of such circumstances, and aligns the center line of a preceding steel sheet and the center line of a following steel sheet so as to be straight, thereby preventing the occurrence of “curve-shaped welding”. It is an object of the present invention to provide a method for controlling a position of a tail end of a steel sheet.

[Means and Actions for Solving the Problems] The method for controlling the tail end position of a steel sheet according to the present invention includes the method of following the tail end of a preceding steel sheet to weld the tip of the succeeding steel sheet to the tail end of a preceding steel sheet. In the method for controlling the tail end position of the steel sheet to be positioned at the tip of the steel sheet, when the remaining length of the preceding steel sheet becomes a predetermined length or less, a passing position of the preceding steel sheet is detected at the exit side of the welding machine, and this detection is performed. Based on the position information, grasp the deviation of the center position of the preceding steel sheet with respect to the center position of the steel sheet feeding line, and change the position of the feed reel for feeding the preceding steel sheet to the welding machine according to the deviation, The center position of the tail end of the preceding steel plate in the welding machine is corrected to the center position of the steel plate feed line.

Until the tail end of the preceding steel sheet leaves the feed reel, the center position of the preceding steel sheet at the exit of the welding machine is repeatedly detected, and each time the position of the feed reel is changed according to the deviation, position accuracy Is preferably increased.

Also, when the remaining length of the preceding steel plate has reached a predetermined length,
In order to prevent interference between the feed reel and the CPC device, it is desirable to change the gain of the CPC device downstream of the welding machine. In this case, the gain of the CPC device is changed by changing the gain of the feed reel CPC device in accordance with the sheet thickness, the line speed, or the shift amount of the feed reel CPC device. Better control can be achieved by changing the gain of the CPC device.

Embodiment An embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a thin plate production line in which a method of controlling a position of a tail end of a steel sheet according to an embodiment of the present invention is used. A strip 2a is fed from the first payoff reel 11 to various downstream facilities at a speed of about 200 m / min. Downstream of the reel 11, a welding unit 30, a bridle roll 40, a transport roll 51, and the like are provided. A desired tension is applied to the running strip 2a by the bridle roll 40. Note that another strip coil is mounted on the second payoff reel 21, and the second payoff reel 21 is on standby to feed the strip coil to downstream facilities as a succeeding strip 2b.

A first payoff reel 11, a second payoff reel 21,
Output units of the CPC devices 15, 25, and 52 are connected to a power supply of a cylinder (not shown) connected to each drive shaft of the transport roll 51. Each cylinder has a role of shifting the reels 11, 21 or the roll 51 in the axial direction.

The light receiving units of the position sensors 13, 23, 53 are connected to the input units of the CPC devices 15, 25, 52, respectively. Each position sensor 1
Reference numerals 3, 23, and 53 denote optical sensors having a light projecting unit and a light receiving unit, and have a role of detecting the transmission or blocking of the irradiation light to detect the passing positions of the strips 2a and 2b.

The welding unit 30 is provided with a flash butt welding machine 32 having a plurality of clamp electrodes. This welding machine
The control unit 32 has a built-in control unit, and the control unit is connected to the outlet side sensor 34 and the inlet side sensor 35 so that the operation of the clamp electrode of the welding machine 32 is controlled based on the position detection signals from the sensors 34 and 35. It has become. Each of the sensors 34 and 35 is a position sensor in which the light emitting and receiving unit is integrated. The control unit of the welding machine 32 is connected to the input units of the first and second CPC devices 15 and 25, and the signal transmission circuit in the control unit is configured to be switchable. That is, the position detection signals from the sensors 34 and 35 are switched by the welding machine control unit, and the CPC devices 15 and 25 are switched.
Is sent to

In such a sheet manufacturing line, in a steady state,
The centering of the preceding strip 2a is controlled by shifting the payoff reel 11 by the first CPC device 15 and shifting the transport roll 51 by the further CPC device 52 on the downstream side.

Next, a case where the tip of the following strip 2b is welded to the tail end of the preceding strip 2a will be described.

The remaining length of the strip coil of the pay-off reel 11 is detected, and when the remaining length is shorter than a predetermined set value, the transmission circuit of the welding machine controller is switched, and a position detection signal from the sensor 34 is sent to the CPC device 15 to perform welding. The deviation between the center of the preceding strip 2a and the center of the line on the machine exit side is determined. CP
The C device 15 stops the automatic control until the remaining amount of the coil becomes shorter than a predetermined value.If the deviation exceeds the predetermined value, the CPC device 15 controls the cylinder of the payoff reel 11 according to the deviation. The proportional operation is performed, the reel 11 is shifted, and the preceding strip 2a is controlled to be centered. The proportional operation of the cylinder is determined by the gain of the CPC device 15,
Usually it is one to one or less so that the strip 2a does not go too far. At this time, the gain of the CPC device 15 is changed in order to prevent interference with the CPC device 52 on the downstream side. The gain is determined by three factors: the thickness of the strip, the feed speed, and the amount of shift of the reel. The gain of the downstream CPC device 52 is changed in accordance with the gain of the CPC device 15.

After a lapse of a predetermined time from the initial position detection when the remaining coil length becomes shorter than the predetermined length, the CPC device 15 further controls the centering of the payoff reel 11 based on the position detection signal of the sensor. Such a centering control operation is repeated until the deviation between the welding machine outlet side strip and the line becomes less than a predetermined value.

When the tail end of the preceding strip 2a leaves the payoff reel 11 and approaches the welding machine 32, the feeding speed of the strip 2a is reduced, and the feeding of the strip 2a is stopped where the tail end is located in a proper position of the welding machine 32. . The tail end of the preceding strip 2a is gripped by one clamp electrode. Next, the trailing strip 2b is fed from the second payoff reel 21 to the welding machine 32 while performing centering control, and the leading end face of the trailing strip 2b abuts on the tail end face of the preceding strip 2a. The leading end of the following strip 2b is gripped by the other clamp electrode.

After clamping, the electrodes are energized while applying a rolling force in the longitudinal direction of the strips 2a and 2b, and the butt joint is flash butt welded. After releasing the clamp,
The bridal roll 40 and the payoff reel 21 are rotated to feed the strip downstream.

According to the above embodiment, the center of the tail end of the preceding strip 2a can be substantially located at the center of the line, so that the shift amount of the following strip 2b is significantly reduced,
It is possible to prevent the occurrence of "curvature" or "bending" of the butt weld 3, and as shown in FIG. 2, the center lines of the leading strip 2a and the trailing strip 2b are aligned.

[Effects of the Invention] According to the present invention, it is possible to effectively prevent the occurrence of a "curve" or "bend" in a welded portion between a preceding steel sheet and a following steel sheet, and to provide a center line between the preceding steel sheet and the following steel sheet. Are aligned in a straight line, so that the line passing property is improved, and by passing the steel sheet correctly through the center of the line, it is possible to make a great contribution to improving the workability in the post-process.

In a line having a surface treatment step, the quality of a steel sheet can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an outline of a steel sheet manufacturing line using a steel sheet tail position control method according to an embodiment of the present invention.
FIG. 3 is a plan view showing a leading steel plate and a trailing steel plate welded together, FIG. 3 is a schematic diagram showing an outline of a steel plate manufacturing line using a conventional steel plate tail end position control method, and FIG. It is a top view which shows the precedent steel plate and the succeeding steel plate which were joined. 2a, 2b; steel plate, 11, 21; feed reel, 15, 25, 52; CPC device, 1
3,23,34,35,53; Sensor, 32; Welder, 40,51; Roll

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Harutomo Yuta 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Shuichi Toba 2951-4, Ishikawacho, Hachioji-shi, Tokyo Nireco Co., Ltd. (56) References JP-A-62-248566 (JP, A) JP-A-59-42120 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21C 45/00-49 / 00 B21B 15/00 B23K 9/025

Claims (1)

(57) [Claims] A method for controlling a tail end position of a preceding steel plate to weld the tip of a following steel plate to the tail end of a preceding steel plate. When the remaining length becomes equal to or less than a predetermined length, a passing position of the preceding steel sheet is detected at the exit side of the welding machine, and based on the detected position information, the center position of the preceding steel sheet with respect to the center position of the steel sheet feeding line. The deviation of the preceding steel plate is changed according to the deviation, and the position of the feed reel for feeding the preceding steel plate to the welding machine is changed, and the center position of the tail end of the preceding steel plate in the welding machine is set at the center of the steel plate feeding line. A method for controlling the position of a tail end of a steel sheet, wherein the position is corrected.