JP2003191004A - Apparatus and method for turning thick plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for turning a thick plate by which the thick plate is turned in order to change the rolling direction of the thick plate in the rolling of the thick plate. <P>SOLUTION: On both sides of the conveying direction of the thick plate, the beginning of the turning of the thick plate is assisted by imparting force in the diagonal positions of the tip and the tail end of the thick plate by hydraulic pressure by jetting liquid against the side faces in the vicinities of the tip and the tail end of the thick plate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a slab rolling device in a reverse type thick plate rolling line in which a slab is rolled into a thick steel plate.

[0002]

2. Description of the Related Art A thick plate rolling mill has a step of rotating a thick plate (slab) by 90 ° in order to perform tenter rolling after the completion of forming and rolling of the thick plate (slab). In Figure 2,
The top view of the plate rolling line is shown. The slab 1 is
It is reciprocally conveyed back and forth on the conveyance table 5, and is rolled a predetermined number of times by the plate rolling mill 6. At this time, the thick plate (slab) 1 is turned by 90 ° if necessary for the width of the thick plate or the like.

This turning is carried out by a turning device (turning table) 2 in which a large number of turning rolls 4 having different diameters are arranged at the center of the conveying line. The turning rolls 4 are arranged so that the large-diameter portions and the small-diameter portions are alternately arranged, and the thick plates 1 are turned by rotating these turning rolls in opposite directions. Here, at the time of turning, the side guide 3 is appropriately moved to position the thick plate to facilitate turning. Needless to say, when the thick plate 1 is simply transported, the turning rolls are all rotated in the same direction in accordance with the transport direction.

[0004]

However, in the turning device as described above, it takes a certain time until the thick plate starts to rotate from the stationary state, which is a problem. The time until the thick plate starts to rotate is greatly affected by the size, shape, and the like of the thick plate, and particularly, the influence of the warp of the thick plate is large.

By the way, the present inventors have already disclosed in Japanese Patent Laid-Open No. 2000-6.
As disclosed in Japanese Patent No. 1522, there is proposed a thick plate rolling device having a mechanical lever that assists rolling when the thick plate starts to rotate from a stationary state. However, in the thick plate rolling device, since it is necessary to bring the lever into contact with the side surface of the thick plate, there is a risk of flaws, and there is a concern that the lever may not retract and may collide with the thick plate.

The present invention solves the above-mentioned concerns and enables non-contact assisting of rolling at the start of rolling of the thick plate to further improve the quality of the thick plate and ensure the reliability of the equipment, and further shorten the rolling time. A thick plate rolling device that realizes the above is provided.

[0007]

The present invention has solved the above-mentioned problems by a thick plate rolling device and a thick plate rolling method described below. In thick plate rolling, a thick plate rolling device that rolls the thick plate to change the rolling direction of the thick plate, and jets liquid to both sides in the transport direction of the thick plate to the side surfaces near the leading and trailing ends of the thick plate. A thick plate rolling device characterized by comprising a liquid ejecting device for applying an external force by doing so. The thick plate rolling device according to the above, wherein a plurality of the liquid ejecting devices are arranged on both sides of the thick plate in the conveying direction. The thick plate rolling device as described in the above item 1 or 2, wherein the liquid ejecting device is installed so as to be movable in a transport direction of the thick plate. In thick plate rolling, a thick plate rolling method for rolling a thick plate to change the rolling direction of the thick plate, wherein a liquid is jetted to the side surfaces near the leading and trailing ends of the thick plate on both sides in the transport direction of the thick plate. By doing so, a force is applied to the diagonal position of the leading edge of the thick plate by the hydraulic pressure to assist the start of rotation of the thick plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a plan view of the thick plate rolling device of the present invention and a view taken along line AA thereof. The turning rolls 4 in the turning device 2 have different diameters with the center of the conveying line as a boundary, and are arranged so that the large diameter portions and the small diameter portions are alternately arranged to form a turning table. Then, these turning rolls are made to rotate in opposite directions to each other when the thick plate 1 is turned.

Here, in the present invention, the turning roll 4
An external force is applied to the thick plate 1 by injecting a liquid jet 11 to the side surfaces of the thick plate 1 in the vicinity of the leading and trailing ends of the thick plate 1 on both sides in the transport direction of the thick plate so that the rolling at the start of rolling The liquid ejecting apparatus 10 for assisting is arranged. Since the turning of the thick plate is performed in both the forward and reverse directions, it is preferable to dispose a plurality of liquid ejecting apparatuses 10 for ejecting near the leading and trailing ends on both sides of the turning table in the conveying direction of the thick plate. Further, a large number of liquid ejecting apparatuses 10 (for example, about 5 units each) may be arranged on both sides, and the liquid ejecting apparatuses 10 may be selected and used depending on the size of the thick plate. By doing this, it becomes possible to inject accurately near the tip end of the thick plate, external force can be accurately applied near the tip end of the thick plate, the turning force at startup is increased, and it is necessary for turning. You can save time.

Further, it is preferable that a liquid ejecting apparatus moving mechanism 12 that is movable in a direction indicated by an arrow in FIG. 1 is provided, and the liquid ejecting apparatus 10 is moved according to the size of the thick plate to set the position. To do. In order to reduce the moving distance of the liquid ejecting apparatus 10, it is preferable that two liquid ejecting apparatuses 10 are provided for the front and rear ends of the thick plate, and a liquid ejecting apparatus moving mechanism 12 is provided for each of the liquid ejecting apparatuses 10 so as to be movable. . By doing so, it is possible to inject more accurately in the vicinity of the leading and trailing ends of the thick plate, and the time required for turning can be further shortened.

Water is preferably used as the liquid to be applied, and if available, rolling oil or the like may be used. Also,
As the liquid ejecting apparatus, a water pressure nozzle or the like for ejecting high pressure water is preferably used. The jetted liquid is preferably jetted at high pressure for a short time so that the temperature of the thick plate is not lowered. Moreover, the fountain flow 11 may instantly discharge high-pressure water to form a water mass.

The thick plate rolling method of the present invention to which the liquid ejecting apparatus is applied will be described below in the order of steps. (1) A thick plate (steel plate or the like) is stopped on the turning table. (2) Start the turning roll operation of the turning table. (3) At about the same time as (2), the liquid ejecting device ejects a fountain jet toward the front and rear end side surfaces of the thick plate to assist the start of turning of the thick plate, and then stops the ejection. (4) After the start of turning, the turning rolls turn in a predetermined direction to complete a series of turning steps.

[0013]

[Examples] Twelve steel plates having a width of 1218 mm and a length of 4500 to 5278 mm at the time of turning and a length direction of the steel plate in the line direction before turning are the conventional examples (two examples). ) And the present invention example (3 examples) were each turned by 90 ° on a turntable, and the two were compared.

In the conventional example 1, the turning is carried out only by the turning table. Further, in Conventional Example 2, the lever assist disclosed in Japanese Patent Laid-Open No. 2000-61522 is also used. On the other hand, in Inventive Example 1, two nozzles (liquid ejecting devices) were fixedly arranged on both sides of the turntable for the front and rear ends to assist the turn. Further, in Inventive Example 2, five nozzles were arranged on each side, and the nozzles were selected according to the size of the thick plate and used. Further, in the third example of the present invention, the nozzle moving mechanism was provided, and the nozzles were aligned so that the nozzles were positioned at the front and rear end positions of the thick plate, and the injection was performed.

The above results are summarized in Table 1.

[0016]

[Table 1]

From Table 1, the effect of the present invention is clear,
The average turning time can be reduced by up to about 40%, and the present invention also eliminates the risk of flaws.

[0018]

According to the present invention, the time until the start of turning of the thick plate turning device can be greatly shortened. Further, according to the present invention, it is possible to improve the efficiency of the turning work without being affected by the size and shape of the thick plate, and at the same time, improve the quality of the thick plate and ensure the reliability of the equipment.

[Brief description of drawings]

FIG. 1 is a plan view (a) of a turning device of the present invention and its AA.
It is a view (b).

FIG. 2 is a plan view illustrating a plate rolling device in a plate rolling line.

[Explanation of symbols]

1 slab (thick plate) 2 Turn device (turn table) 3 Side guide 4 turning rolls 5 transport rolls 6 (Thick plate) rolling mill 7 base 10 Liquid ejector (nozzle) 11 Liquid jet (fountain flow) 12 Liquid ejector moving mechanism

Claims (4)

[Claims] 1. A thick plate rolling device for rolling a thick plate in order to change the rolling direction of the thick plate, wherein the thick plate rolling device is provided on both sides in the conveying direction of the thick plate, and is a side surface near the leading end of the thick plate. A thick plate rolling device characterized by comprising a liquid ejecting device for applying an external force by ejecting a liquid against the liquid ejecting device. 2. The thick plate rolling device according to claim 1, wherein a plurality of the liquid ejecting devices are arranged on both sides of the thick plate in the conveying direction. 3. The thick plate rolling device according to claim 1, wherein the liquid ejecting apparatus is installed so as to be movable in a transport direction of the thick plate. 4. A thick plate rolling method for rolling a thick plate in order to change the rolling direction of the thick plate, which is a side surface near the leading and trailing ends of the thick plate on both sides in the conveying direction of the thick plate. On the other hand, a method of rolling a thick plate characterized in that the liquid pressure is applied to apply a force to a diagonal position of the leading edge of the thick plate to assist the start of the rotation of the thick plate.