JPH04270001A - Method for improving shape of checkered plate - Google Patents

Abstract

PURPOSE:To straighten the shape over total length, without crushing the checkered mark, on the time for straightening the shape of the hot strip with the checkered mark. CONSTITUTION:On the shape improving method of the checkered plate to straighten the hot strip 1 with the checkered mark on the skin pass line 10, the checkered hot strip 1 is welded by lapping it with the flat strip 2 with the spot welding machine set in the skin pass line 10, and the above checkered hot strip 1 is straightened only with the tension leveler 18 set in the above skin pass line 10.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the shape of a striped steel plate by correcting the shape of a striped hot strip at the skin pass line of a hot strip coil.

0002

BACKGROUND OF THE INVENTION Conventionally, striped hot strips have been hot-rolled and then corrected in shape using a skin pass mill in a batch process of one coil at a time.

0003

[Problems to be Solved by the Invention] However, the prior art has the following problems (1) and (4).

[0004] Since striped hot strips are batch-processed one coil at a time, no tension is applied to the tip and rear ends of the coil, each about 10 m long, making it impossible to correct the shape.

[0005] Striped hot strip is shaped by being rolled down in a skin pass mill, and the striped height during hot rolling is reduced by about 0.2 to 0.4 mm, impairing quality.

An object of the present invention is to correct the shape of a striped hot strip without destroying the stripes and over the entire length of the coil.

[0007]

Means for Solving the Problems The present invention as set forth in claim 1 provides a method for improving the shape of a striped steel plate in which a striped hot strip is corrected in shape at a skin pass line. A hot strip and a flat strip are overlapped and welded, and the shape of the striped hot strip is corrected only by a tension leveler provided within the skin pass line.

According to a second aspect of the present invention, the striped hot strip is threaded with the stripes set on the upper surface side,
The striped hot strip is set on the upper surface side of the flat strip by the swinging of the preceding material clamping device or the succeeding material clamping device of the spot welding machine, whether it is a leading material or a trailing material. They are overlap welded together.

[0009]

[Operation] According to the present invention as set forth in claim 1, the following
It has the function and effect of

[0010] The striped hot strip is connected to a flat strip and processed continuously, and the shape is corrected over the entire length of the coil. Therefore, the camber after slitting the strips or the warping when cut into plates can be reduced, and the quality can be improved.

[0011] Since the shape of the striped hot strip is corrected only by the tension leveler without using a skin pass mill, the shape can be corrected while maintaining the stripe height during hot rolling, and the quality can be improved.

According to the present invention as set forth in claim 2, the following
It has the function and effect of

[0013] With the striped hot strip, the stripes are set on the upper surface side, and regardless of whether it is a leading material or a trailing material, by swinging the leading material clamping device or the trailing material clamping device, It is set on the top side of the flat strip and overlap welded. Therefore, the non-striped surface of the striped hot strip can always be brought into contact with the surface of the flat strip for spot welding, and the striped hot strip and the flat strip can be reliably overlapped and welded using a spot welding machine.

[0014]

[Example] Fig. 1 is a schematic diagram showing an example of a skin pass line in which the present invention is implemented, Fig. 2 is a front view showing a spot welding machine, and Fig. 3 is a schematic diagram showing a welding procedure for a preceding material and a succeeding material. FIG. 4 is a schematic diagram showing the welding state when the striped hot strip is the trailing material, and FIG. 5 is a schematic diagram showing the welding state when the striped hot strip is the preceding material.

In the skin pass line 10 of FIG.
1 is a payoff reel, 12 is a payoff leveler, 13 is an entry shear, 14 is a spot welder, 15 is an entry bridle roll, 16 is a tension meter roll, 17 is a skin pass mill, 18 is a tension leveler, 19 is an exit bridle 21 is an exit shear, and 22 is a tension reel.

In the skin pass line 10, the trailing coil loaded into the payoff reel 11 has its warp corrected by the payoff leveler 12, and then the leading end is moved to the entry side shear 13.
will be cut. On the other hand, the rear end of the preceding coil is cut by a rotary shear in the spot welding machine 14. The rear end of the leading coil and the tip of the trailing coil are
In the spot welding machine 14, they are overlapped and spot welded as will be detailed later.

[0017] The skin pass line 10 includes a spot welded continuous coil that is connected to an entrance bridle roll 15.
While maintaining the tension between the bridle roll 19 and the exit side bridle roll 19,
Reduce pressure with skin pass mill 17 and tension leveler 1
8, the shape can be corrected. Depending on the use of the coil, it is possible to use either the skin pass mill 17 alone, the tension leveler 18 alone, or both the skin pass mill 17 and the tension leveler 18 in common.

In the skin pass line 10, the welded portion of the coil after shape correction that has passed through the skin pass mill 17 and the tension leveler 18 is cut by an outlet shear 21, and the product coil is wound onto a tension reel 22.

However, in the skin pass line 10, the spot welding machine 14 is constructed as follows. That is, in FIG. 2, 30A is an upper electrode and 30B is a lower electrode. The preceding material clamping device 31 for the preceding coil is provided with a tilt cylinder 33 in addition to a clamp cylinder 32, and can swing around a support shaft 34 with respect to the pedestal 14A by the operation of the tilt cylinder 33. Further, the trailing material clamping device 35 for the trailing coil is provided with an index cylinder 37 in addition to a clamp cylinder 36, and can be moved back and forth with respect to the pedestal 14A by the operation of the index cylinder 37.

As a result, in the skin pass line 10, when the striped hot strip 1 is threaded with the stripes set on the upper surface side, the striped hot strip 1 has the following properties:
Regardless of whether it is a leading material or a trailing material, the leading material clamping device 31 of the spot welding machine 14 swings to set it on the upper surface side of the flat strip 2 and to overlap and weld it.

Striped hot strip 1 and flat strip 2 when striped hot strip 1 is the trailing material
The welding procedure will be explained below with reference to FIGS. 3 and 4.

(1) The rear end of the leading flat strip 2 and the leading end of the trailing striped hot strip 1 are stopped in the spot welding machine 14, and the flat strip 2 and the trailing hot strip 1 are welded together. The material is clamped by the material clamping device 31 and the trailing material clamping device 35, and cut by a rotary shear (see FIG. 3(A)).

(2) The preceding material clamping device 31 is swung to tilt the rear end of the preceding flat strip 2 downward (see FIG. 3(B)).

(3) Move the trailing material clamping device 35 forward and set the tip of the trailing hot strip 1 on the upper surface side of the rear end of the leading flat strip 2 (FIG. 3(C))
reference). (4) Lower the leading material clamping device 31 until the upper surface of the leading flat strip 2 becomes the lower surface of the trailing striped hot strip 1 and set it horizontally, and then clamp the leading edge of the trailing striped hot strip 1 and the leading flat strip 2. The overlapping portion with the rear end of the is set horizontally (see FIG. 3(D)).

(5) In the state of (4) above, the electrode 30
Spot weld with A and 30B (see Figure 4).

Furthermore, when the striped hot strip 1 is a preceding material, the swinging of the preceding material clamping device 31 causes
The rear end of the leading striped hot strip 1 is set on the upper surface side of the tip of the trailing flat strip 2, and the leading material clamping device 31 is placed so that the lower surface of the leading striped hot strip 1 is on the upper surface of the trailing flat strip 2. Raise it until it becomes horizontal, set it horizontally, and spot weld the two together (see Figure 5).

For the skin pass line 10, the striped hot strip 1 and the flat strip 2 are overlapped and welded as described above using the spot welding machine 14, and the striped hot strip 1 is welded using the tension leveler 18. Only the shape is corrected.

Next, the operation of the above embodiment will be explained.

(2) The striped hot strip 1 is connected to the flat strip 2 and processed continuously, and the shape is corrected over the entire length of the coil. Therefore, the camber after slitting the strips or the warping when cut into plates can be reduced, and the quality can be improved.

(2) Since the shape of the striped hot strip 1 is corrected only by the tension leveler 18 without using the skin pass mill 17, the shape can be corrected while maintaining the stripe height during hot rolling, and the quality can be improved.

■ With the striped grain hot strip 1, with the stripes set on the upper surface side, the flat strip 2 is fixed by the swinging of the leading material clamping device 31, regardless of whether it is a leading material or a trailing material. It is set on the top side and overlap welded. Therefore, the non-striped surface of the striped hot strip 1 can always be brought into contact with the surface of the flat strip 2 for spot welding, and the spot welding machine 14 can ensure that the striped hot strip 1 and the flat strip 2 are overlapped. Can be welded together.

As a specific embodiment of the present invention, the above-mentioned skin pass line 10 is used, and the plate thickness is 6.5 mm and the plate width is 2.
Good results were obtained by correcting the shape of a 200 mm striped hot strip using a tension leveler 18 with a maximum output tension of 42.5 tons.

[0033]

As described above, according to the present invention, when correcting the shape of a hot strip with stripes, the shape can be corrected over the entire length of the coil without destroying the stripes.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a skin pass line in which the present invention is implemented.

FIG. 2 is a front view of a spot welding machine.

FIG. 3 is a schematic diagram showing the welding procedure of the preceding material and the succeeding material.

FIG. 4 is a schematic diagram showing a welding state when a striped hot strip is the trailing material.

FIG. 5 is a schematic diagram showing a welding state when a striped hot strip is the preceding material.

[Explanation of symbols]

10 Skin pass line 14 Spot welding machine 17 Skin pass mill 18 Tension leveler 31 Preceding material clamping device 35 Trailing material clamping device

Claims (2)

[Claims] [Claim 1] A method for improving the shape of a striped steel plate that corrects the shape of a striped hot strip using a skin pass line, comprising:
The striped hot strip and the flat strip are overlapped and welded using a spot welding machine provided within the skin pass line, and the shape of the striped hot strip is corrected only by a tension leveler provided within the skin pass line. Method for improving the shape of striped steel plates. 2. The striped hot strip is threaded with the stripes set on the upper surface side, and whether the striped hot strip is a leading material or a trailing material, the spot welding machine 2. The method for improving the shape of a striped steel plate according to claim 1, wherein the flat strip is set on the upper surface side and overlap welded by swinging a preceding material clamping device or a succeeding material clamping device.