JPH03281014A - Temporarily fastening method for inner peripheral part of coil - Google Patents

Abstract

PURPOSE:To increase the holding force between the strips and to prevent the loosening of the inner peripheral part by winding the strip to the reel, pressing the welding electrode to the reel, energizing the electrode and welding between the strips. CONSTITUTION:The coil is bitten with the gripper 5 slitted on the surface in axial direction and wound by one or several times and the gripper part is turned to the direction of welding electrode 31 and the reel 2 is stopped. Then several points on the strip along the gripper 5 parallely are welded with the stud welder 3, and after the electrode 31 is released, the coil is wound up. Therefore, when it is hung up with the magnet crane, the trouble of the next process like a run out is prevented from generating without slipping down in the bamboo shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a temporary welding method for the inner circumference of a strip coil for the purpose of preventing the inner circumference from loosening.

[Prior Art 1] In box-shaped annealing of rolled strip coils, the coils are lifted up by a magnetic crane in order to be stacked vertically in the width direction. At this time, if the holding force between the strips is weak, there are problems such as the inner peripheral part slipping down like a bamboo shoot, or the inner peripheral part loosening in the next process, making it difficult to insert the reel. As a countermeasure for this, there is a method of fixing the inner circumference with a fold-in band as shown in Figure 2a, but at the beginning of winding the electrolytic cleaning line, stop the line and insert the band, and then
After winding six turns, both sides of the band had to be folded into the coil side, which not only greatly hindered efficiency but also was a very dangerous task for the operator. Moreover, during annealing, the band softens and breaks, or the band has to be collected during the next step of punching, or the band may get caught in the roll, causing damage to the roll.

Still other conventional techniques include spot welding the side surface of the inner peripheral end (Fig. 2b) or welding a metal ribbon to the inner peripheral end (2nd rM c ); however, in the former method, the end surface Since the welding is done only by welding, the adhesion may be incomplete, or the weld bead may get caught during temper rolling, which is the next step after annealing, and damage the roll. The latter method is inefficient and not only requires a long time for welding, but also requires time and effort to recover the metal ribbon in the next process.

[Problems to be Solved by the Invention] The present invention aims to solve these problems of the prior art and safely and efficiently prevent the inner peripheral portion from loosening or slipping down.

[Means for Solving the Problems] The present invention uses a take-up reel as a ground, a welding electrode is provided externally, and after the reel has been wound around the strip once or several times, the welding electrode is pressed against the reel and energized, By welding the strips together, the holding force between the strips is strengthened and the inner peripheral portion is prevented from loosening.

[Operation] The operation of the present invention will be explained based on the embodiment shown in FIG. FIG. 1 shows the state immediately after the strip 1 is wound onto the reel 2.

Gripper 5 with fill slit in the axial direction of the reel surface
After the reel 2 has been wound once or several times, a part of the gripper is directed toward the welding electrode 31 and the reel 2 is stopped. Then, the stud welding machine 3 welds several points on the strip parallel to the gripper 5 to release the electrode 31 and then wind up the coil.

Depending on the welding conditions, strip 1 and reel 2 may come into close contact, but by adjusting the pressing pressure of electrode 31 and selecting the current value, it is possible to set the strips to adhere with sufficient holding force and not to come into close contact with reel 2. value can be obtained.

In order to fully achieve the purpose of the present invention, selection of welding conditions is essential. If the holding force between the strips is incomplete, the inner periphery will slip off like a bamboo shoot when lifted by a magnetic crane, and the inner periphery will become loose, making it difficult to insert it into the payoff reel.

If the holding force between the strips is too strong, the strips will not fall off when lifted, but the strips may tear, turn up, or slip during the next step of removing the ends, so it is necessary to set the current value and electrode pressing force appropriately. be.

[Example〕 Referring again to FIG. 1, an embodiment of the present invention will be described.

Target strip is 0. When a mild steel material of 8m+X 1013+om is gripped by the gripper 5 and wound four times, the reel 2 is stopped with a part of the gripper facing upward. Therefore, the electrode pressing pressure was set to 30 kg using the stud welding robot 3, and three points were welded at equal intervals on the strip 1 parallel to the gripper 5, and after the electrode 31 was released, the coil was wound up. The coil was extracted, turned up and down in the width direction of the coil using an up-ender, and lifted up by a magnetic crane and transported to the annealing process to complete the annealing process. It was transported again by a magnetic crane to the next process, the temper rolling yard. After the coil was cooled, it was inserted into a payoff reel of a skin pass rolling mill and a skin pass rolling operation was performed. There was a concern that the strip would turn over due to the close contact caused by the welding during the cutting process, which involves passing through the end of the coil, but no problems occurred. Of course, unlike the conventional method, there is no generation of band waste. Through various tests, we found the optimum values for the number of turns of the strip during welding, the pressing force of the welding electrode, the current value, etc.

Table 1 below shows the results of the test.

Table 1: Good O Generally good △ Poor A problem occurs. On the other hand, if the current value and pressing force are insufficient, the adhesion will be incomplete.

One turn is sufficient, but thin materials may cause too much welding.
The result was better if it was rolled several times, as this would cause it to turn over during the next process of removing the bottom.

In this way, depending on the thickness and width of the strip, the number of welding points and the pressure and current value for pressing the electrode are selected so that when lifted with a magnetic crane, it will not fall off like a bamboo shoot, and trouble will occur during the next process of removing the bottom. is gone.

[Effects of the Invention] By implementing the present invention, it has become possible to reduce the number of workers on the outlet side of the electrolytic cleaning line to one person, and it has become unnecessary to insert a dangerous fold-in band. Additionally, there is no longer a need to stop twice when inserting the band and when folding it in, resulting in a significant improvement in efficiency.

There have been no incidents where the band softened and broke during box annealing, causing the inner periphery to fall off and form a bamboo shoot shape when lifted by a magnetic crane. Furthermore, since no band waste is generated during the next process of removing the tail from the payoff reel, there is no need for band waste to get caught in the roll and to remove it.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a state of a coil fastened by a conventional method. (1) shows the state in which the folded band is cut right above. ■ = Strip reel 3: Stuffed welding robot

Claims (1)

[Claims] A method for temporarily fixing the inner periphery of a strip coil, characterized by temporarily welding the strips together using a stud welder, using a reel around which the metal strip coil is wound as a ground.