JP3319892B2 - Continuous hot rolling equipment for billets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a series of continuous hot rolling equipment suitable for continuously rolling several to several tens of billets such as sheet bars, slabs, billets or blooms. is there.

[0002]

2. Description of the Related Art Conventionally, in a hot rolling line for a billet, a billet to be rolled has been heated, rough-rolled and finish-rolled one by one to finish a hot-rolled sheet having a desired thickness. In the rolling method of (1), it is unavoidable that the line is stopped due to poor biting of the rolled material in the finish rolling, and there is also a significant disadvantage that the yield is reduced due to the defective shape of the leading and trailing ends of the rolled material.

[0003] For this reason, recently, the leading and trailing ends of a billet to be rolled are joined together before the finish rolling, and then continuously fed to a hot rolling line for rolling. Endless rolling has been implemented, and in this regard, in order from the rough rolling mill, the winding device, shear, fixed welding machine, looper,
Reference is made to equipment as disclosed in JP-A-58-112601 in which a finish rolling mill is arranged.

The technique disclosed in the above publication is of a type in which a welding machine for joining billets is fixed on a line, and a speed difference generated between a rolling process and a joining process is absorbed by a looper. However, the conventional equipment disclosed herein does not allow stable rolling with load fluctuations during rolling because the slab is locally cooled by contact with the looper, and also the quality of the product There was a disadvantage that variation occurred.

As an attempt to solve such a problem, there is disclosed a technique disclosed in Japanese Patent Application Laid-Open No. Sho 60-244401 in which a joining machine performs a joining operation while synchronizing the joining machine with a billet conveying speed. Although known, such a technique also has the following inconvenience, and a solution to the problem has been desired.

[0006] That is, the conventional equipment, when it becomes necessary to replace the equipment incorporated in the line during operation,
Since the replacement work of the equipment is performed using a crane or the like, a large amount of time is required, and the operation rate of the line is low.

[0007] In a continuous hot rolling line, so-called ordinary rolling (intermittent rolling) without joining work of billets is performed.
In the case of carrying out, the tip of the billet may collide with the table and jump up due to the high speed of conveying the billet, and the jumped billet interferes with the crop shear, the joining device, and the bad joint removing device. As a result, there was a problem that the rolling operation had to be stopped as a result of stopping the transportation of the billet.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new and simple method for exchanging equipment easily and quickly even during operation of a line, and for performing a stable operation regardless of continuous rolling or normal rolling. Is to propose a simple equipment line.

[0009]

SUMMARY OF THE INVENTION The present invention provides a crop shear for cutting a rear end of a preceding steel slab and a front end of a succeeding steel slab, and a movable type for joining the ends of the cut slab. In the continuous hot rolling equipment row of slabs in which the joining device and the slab are sequentially arranged, moving means for moving the crop shear horizontally in a direction intersecting the conveying direction of the slab, and offline and online, is arranged. It is a continuous hot-rolling equipment train of a billet, characterized in that the crop shear preferably has a fill-in table roller for supporting the billet being conveyed at an online position after being taken off-line. Further, the present invention provides a mobile joining device for joining a rear end portion of a preceding billet and a leading end portion of a succeeding billet, and a joint defective portion removing device for removing a defective portion generated at the time of joining a billet. In the continuous hot rolling equipment row of sequentially arranged slabs, moving means for horizontally moving the poor joining portion removing device in a direction intersecting with the direction of transporting the slabs, offline and online, is provided. It is a continuous hot rolling equipment line which is characterized in that it is preferable that the defective joining portion removing device has a fill-in table roller that supports a steel piece being conveyed at an online position after being taken off-line. The joining device has a moving unit that moves along the width direction of the steel slab and makes the device main body offline and online.

[0010]

According to the present invention, since the crop shear and the defective joint removing device have moving means and can be made offline or online, it is easy and quick to replace such equipment during operation.

In the case where the billet is continuously transported even after the equipment placed on the rolling line is taken off-line, there is a possibility that the billet cannot be supported in the area where the equipment is placed. It is desirable to install a fill-in table roller for supporting a billet having a moving means similar to that of the above-described device in an empty space that can be obtained by taking the apparatus for removing a defective joint part off-line.

With regard to the joining apparatus, there is sufficient space for simply passing the billet even during normal rolling, but there is no danger of collision due to deformation of the billet. It is preferable to have transportation means that can be brought online.

[0013]

1 to 4 show the construction of an equipment line according to the present invention.

In the figure, reference numeral 1 denotes a leading billet, 2 denotes a trailing billet, 3 denotes a rear end of the leading billet 1 and a leading end of the trailing billet 2 is cut into a predetermined shape, for example, a drum type. Crop shear 4 is a pressing means 4 which heats and raises the temperature of the end of the cut piece and presses and joins each piece 1 and 2 to each other.
b, a mobile joining device comprising:
Is provided with a heating means 4a such as an induction heating coil and a clamp 4b for positioning and pressing the billet.

Reference numeral 5 denotes a table roller for conveying a steel piece that can be moved up and down in accordance with the movement of the welding device 4. Reference numeral 6 denotes a plurality of cutting blades 6b provided around a drum 6a. A defective joint removing device for removing defective parts (elevated parts, burrs, etc.) on the front and back surfaces, 7 is a group of hot finishing rolling mills for continuously rolling the joined steel pieces, and 8 is a rail 8a and hydraulic means. 8b is a moving means for moving the crop shear 3 in the width direction of the steel slab to make it offline and online. Reference numeral 8c denotes an openable latch, which is closed only when the crop shear 3 is moved, and is opened when it is not moved, so that the rod of the hydraulic means 8b can retreat outside the line.

Reference numeral 9 denotes a rail 9a and hydraulic means 9b, and a moving means for moving the defective joint removing device 6 in the width direction of the steel slab to make it offline or online, 9c denotes an open / close latch similar to 8c, 10c , 11 are fill-in table rollers for supporting the billet on the line after the crop shear 3 and the defective part removing device 6 are taken off-line.
Reference numerals 2 and 13 denote trolleys on which the fill-in table rollers 10 and 11 are mounted, respectively, reference numerals 14 and 15 denote hydraulic means for moving the trolleys 12 and 13 along the longitudinal direction of the billet, respectively.
Is a hydraulic means for moving the heating means 4a of the joining device 4, and 17 is a hydraulic means for moving the clamp 4b of the joining device 4.

FIG. 1 shows an example in which a preceding steel slab 1 and a following steel slab 2 are butt-joined at their ends and continuous hot rolling is performed.

The rear end of the preceding slab 1 and the front end of the following slab 2 are first cut by a crop shear 3 and finished in a shape suitable for butt joining.

Next, the steel slabs 1 and 2 are positioned while being transported by the clamp 4b of the joining device 4 with a small gap therebetween, heated and heated by the heating means 4a, and pressed by the clamp 4b. Complete the butt joint.

After the joining is completed, the steel slab is guided to the finishing rolling mill group 7 by removing the defective joints (protrusions and burrs generated by butt joining) generated at the time of joining by the removing device 6. become.

In such a row of equipment, the crop shear 3 and the defective joint removing device 6 are taken off-line in order to perform normal intermittent rolling without joining the billets, and instead, the fill-in table rollers 10 and 11 are placed on the line. (In the case where conventional intermittent rolling in which the billets are not joined) is performed according to the following procedure.

First, the hydraulic means 8 and 9 are actuated to retract the crop shear 3 and the defective joint removing device 6 out of the line along the rails 8a and 9a, respectively, as shown in FIG. Is mounted on the trolley 12, and the defective joint removal device 6 is mounted on the trolley 13.

Then, as shown in FIG.
4 and 15, the carts 12 and 13 are respectively moved to connect the fill-in table rollers 10 and 11 to the hydraulic means 8 and 9, and the fill-in table rollers 10 and 11 are connected by the hydraulic means 8 and 9 as shown in FIG. Are brought into the line and brought online.

[0024] Such an equipment arrangement is a steel slab which is unlikely to cause biting defects and troubles at the time of butt removal even if continuous rolling is not performed, such as a very thick material having a finished plate thickness exceeding 6.0 mm. This is particularly effective in the case of targeting.

When the joining device 4 is taken off-line, the heating means 4a and the pressing means 4 are
b may be withdrawn from the line.

When the crop shear 3 or the defective joint removing device 6 is replaced while the line is in operation, the new crop shear 3 and the defective joint removing device 6 can be easily replaced with the new crop shears 3 and 11 instead of the fill-in table rollers 10 and 11. The replacement may be performed as described above.

In FIGS. 1 to 4 described above, the case of exchanging the equipment using the hydraulic means has been described. However, this is merely an example, and the hydraulic means is implemented by an electric actuator. It does not matter.

[0028]

As described above, according to the present invention, even when the equipment installed on the line needs to be replaced, quick and simple replacement is possible, so that there is no reduction in productivity. In addition, even in the case where normal intermittent rolling is performed using a continuous hot rolling equipment row, the equipment arranged on the line can be taken off-line, so that the steel slab in the transportation process collides with each equipment and rolls. There is no hindrance to the operation.

[Brief description of the drawings]

FIGS. 1a to 1f are diagrams showing a configuration of an equipment row according to the present invention.

FIGS. 2A to 2F are diagrams showing a configuration of an equipment row according to the present invention.

FIGS. 3a to 3f are diagrams showing a configuration of an equipment row according to the present invention.

FIGS. 4A to 4F are diagrams showing a configuration of an equipment row according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leading slab 2 Trailing slab 3 Crop shear 4 Joining device 4a Heating means 4b Pressing means 5 Conveyor table roller 6 Defective joining part removing device 6a Drum 6b Cutting blade 7 Finishing mill group 8 Moving means 8a Rail 8b Liquid pressure Means 9 Moving means 9a Rail 10 Fill-in table roller 11 Fill-in table roller 12 Truck 13 Truck 14 Hydraulic means 15 Hydraulic means 16 Hydraulic means 17 Hydraulic means

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B23K 37/08 B23K 37/08 D (72) Inventor Hideyuki Nikaido 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72 ) Inventor Shigeru Isoyama 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Toshiaki Amagasa 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Person Kunio Miyamoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Hiroshima Factory (72) Inventor Akio Kuroda 4-622 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Hiroshima Works (56) References JP-A-63-160707 (JP, A) JP-A-5-277509 (JP, A) JP-A-5-131320 (JP, A) JP-A-52-132485 (JP, A) ( 58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 15/00 B23D 25/12

Claims (5)

(57) [Claims] Crop shears for cutting the rear end of the preceding slab and the front end of the following slab, and a movable joining device for joining the ends of the slab after cutting are sequentially arranged. A continuous hot rolling equipment for the slab, wherein a moving means for moving the crop shear horizontally in a direction intersecting with the direction of the slab to be offline and online is arranged, Row rolling equipment line. 2. The continuous hot rolling equipment line according to claim 1, further comprising a fill-in table roller for supporting the billet being conveyed at an on-line position after the crop shear is taken off-line. 3. A movable joining device for joining a rear end portion of a preceding billet and a leading end portion of a succeeding billet, and a joining defective portion removing device for removing a defective portion generated when joining the billets. In a continuous hot rolling equipment row of slabs arranged in a row, moving means for horizontally moving the poor joining portion removing device in a direction intersecting with the conveying direction of the slab, and providing offline and online moving means are provided. And continuous hot rolling equipment line. 4. The continuous hot rolling equipment line according to claim 3, further comprising a fill-in table roller for supporting the steel slab being conveyed at an on-line position after the defective bonding portion removing device is taken off-line. 5. The joining apparatus according to claim 1, further comprising a moving unit configured to move along a width direction of the steel slab and make the apparatus main body offline and online. Row of continuous hot rolling equipment.