JPH05200493A - Method for carrying and cooling cast strip in strip continuously casting method - Google Patents

Abstract

PURPOSE:To prevent cut-off of a cast strip on the way of carrying and to enable sufficient cooling by traveling a bypass arranging an auxiliary sheet composed of a metallic sheet at the lower part, directly injecting cooling medium to the cast strip and cooling. CONSTITUTION:The cast strip 8 from horizontal rolls is slided on a sliding table 9 and introduced on an auxiliary sheet 3. The auxiliary sheet 3 is used an aperture metallic sheet or a belt-like metal net and is traveled while stretching the carrying way 15 along a traveling way of the cast strip 8 and the bypass 16 arranged at the lower part. The cooling medium is injected from nozzles 12, 13 to the upper part and the lower part of the traveling way to cool the cast strip 8. In the bypass 16, the nozzles 131, 13m arranged at the lower part is directly injected to cool the cast strip. The cut-off of the cast strip 8 on the way of carrying can be prevented and the cast strip can sufficiently be cooled on the way of carrying.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveying method used for conveying a thin plate slab cast by a continuous thin plate casting method to a winder.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view of a conventional twin roll type thin plate continuous casting method. The molten metal 5 is poured into a molten metal pool formed above the two rotating horizontal rolls 6 and 6'which are arranged in parallel with each other with a gap. The molten metal 5 is brought into contact with the horizontal rolls 6 and 6 ′ and cooled to form a solidified shell on the horizontal rolls 6 and 6 ′. The solidified shell moves following the rotation of the horizontal rolls 6 and 6 ′. , Roll gap minimum part 7
Are joined together to form a thin plate cast piece 8 and sent out from the horizontal rolls 6 and 6 '. In the figure, 9 is a slide table, and the thin plate slabs sent from the horizontal rolls 6 and 6'are
Sliding on the slide table 9 and descending, the transport roller group 1
0, reaches the take-up reel 11 by being conveyed by the conveying roller group 10, and the thin plate cast piece 8 is wound up by the take-up reel 11 to become the coil-shaped cast piece 4. In the figure, 12 and 13 are cooling medium injection nozzles arranged above and below the slab path.

Unlike the thin plate produced by rolling, the thin plate slab has a cast structure and is extremely fragile because it is hot during transportation. For this reason, when the thin plate slab 8 immediately below the horizontal rolls 6 and 6 ′ is sandwiched and guided by, for example, a pinch roll (not shown), the thin plate slab 8 is broken without being able to withstand the pinching force and tension of the pinch roll. Easy to do. According to the knowledge of the present inventors, when the thin-plate cast piece 8 immediately below the horizontal rolls 6 and 6'slides on the slide table 9 and is guided, it reaches the conveyance roller group 10 without breaking.

The transport roller group 10 includes a large number of transport rollers 10.
-1, ..., 10-n. Transport rollers 10-1,
.., 10-n, when the respective peripheral velocities of the thin plate slabs 8 are accurately matched and rotated, the thin plate slab 8 can be conveyed without breaking because a large tensile stress is not generated in the thin plate slab 8. To be done. However, since the transport rollers 10-1, ..., 10-n are unevenly worn or foreign matters are burned on the surface, it is difficult to rotate the transport rollers 10-1 so that their peripheral velocities are accurately matched. The slab often breaks during transportation.

FIG. 5 is an explanatory view of another method of transporting a thin plate slab. In other words, the auxiliary sheet 3 made of a metal strip is stretched between the auxiliary sheet supply reel 1 provided on the inlet side of the slab runway and the auxiliary sheet take-up reel 2 provided on the outlet side of the slab runway. Then, the thin plate cast piece 8 is placed on the auxiliary sheet 3 and conveyed. According to the knowledge of the present inventors, when the thin plate slab 8 is transported by the transportation method of FIG. 5, the thin plate slab does not break during transportation.

However, in the conveying device of FIG. 5, the upper cooling medium injection nozzle 12 can directly inject the cooling medium to the thin plate slab 8, but the auxiliary sheet 3 is on the lower surface of the thin plate slab 8. In addition, the lower cooling medium injection nozzle 13 cannot directly inject the cooling medium onto the thin plate slab 8. For this reason, the thin-plate slab 8 is not sufficiently cooled, and the high-temperature thin-plate slab 8 that is not sufficiently cooled is taken up by the take-up reel 11. There is a problem that the thin plate slab is broken during winding due to the winding tension of the reel 11.

[0007]

DISCLOSURE OF THE INVENTION The present invention, when conveying a thin plate slab by continuous thin plate casting, does not cause breakage in the thin plate slab during transportation, and sufficiently cools the thin plate slab during transportation. It is an object of the present invention to provide a method of transporting and cooling a thin plate slab, which can be done without breaking the slab during winding.

[0008]

Means and Actions for Solving the Problems First of the Invention
5 uses the perforated metal strip plate or the strip-shaped wire mesh provided with the perforations as the auxiliary sheet 3 in the transportation method described in FIG. FIG. 1 shows an example of a perforated metal strip having the perforations 14. The perforated metal strip is obtained by punching the perforations 14 in the metal strip, for example, by punching.
The shape of the opening of the opening 14 is not particularly limited, but it is desirable that the opening be provided uniformly over the entire surface. Although a band-shaped wire net may be used as the auxiliary sheet 3, the mesh shape of the band-shaped wire net may be ordinary one.

As described above with reference to FIG. 5, when a normal metal strip having no apertures 14 is used as the auxiliary sheet of FIG. 5, the cooling medium injection nozzle 13 at the lower side transfers the cooling medium to the thin plate cast piece 8. Instead of directly injecting, the auxiliary sheet will be injected. However, since the cooling medium sprayed onto the auxiliary sheet has a weak force for cooling the thin plate slab 8, the thin plate slab 8 is insufficiently cooled. In the present invention, the cooling medium injected from the lower cooling medium injection nozzle 13 passes through the openings 14 of the perforated metal strip or the mesh of the strip-shaped metal mesh, and is directly injected onto the thin plate cast piece 8. Therefore, the cooling of the thin plate slab 8 is promoted and strengthened. In the present invention, as the cooling medium, for example, water, compressed air or the like can be used.

FIG. 2 is an explanatory diagram of the second method of the present invention. In this method, in the method shown in FIG. 5, the auxiliary sheet 3 is formed by forming a conveying path 15 along the running path of the slab and a detour 16 provided below the running path of the slab and running the sheet. The thin slab is conveyed while being cooled by a cooling medium jetted from cooling medium jet nozzles provided above and below the running path of the thin strip. That is, in the detour 16, the cooling medium injection nozzles 13-1 and 13-m provided below are arranged between the running path of the thin plate slab and the detour to directly inject the cooling medium to the thin plate slab 8. Then, the cooling of the thin plate slab 8 is enhanced. For this reason, the thin plate slab 8 is sufficiently cooled.

In the detour 16 in FIG. 2, there is shown an example in which there is no guide jig for supporting the lower part of the thin plate cast piece 8.
For example, by making the flow rate of the cooling medium ejected from the lower cooling medium injection nozzles 13-1 and 13-m sufficiently larger than the flow rate of the cooling medium ejected from the upper cooling medium injection nozzles 12-1 and 12-m. It is also possible to support the thin plate slab by the jet flow from the cooling medium jet nozzles 13-1 and 13-m below.

Although FIG. 2 shows an example in which the detour 16 is provided at one place, the detour may be provided at several places if necessary. Further, in FIG. 2, an example in which the lower cooling medium injection nozzle 13 is provided in the transport path 15 and the upper cooling medium injection nozzles 12-1 and 12-m are also provided in the bypass 16 has been described. The number of medium ejection nozzles may be reduced or omitted.

[0013]

EXAMPLE FIG. 3 shows a method of transporting and cooling a cast piece of FIG.
The auxiliary sheet take-up reel 2 is provided further rearward (outward side) than the cast piece take-up reel 11, and the auxiliary sheet 3 is arranged by wrapping a part of the outer circumference of the coiled cast piece 4 wound up from the outside. Here is an example. A tension is applied to the auxiliary sheet 3 between the auxiliary sheet supply reel 1 and the auxiliary sheet take-up reel 2. In this example, the thin plate slab 8 is wound without applying tension, but the coiled slab 8 is wound between a portion P to Q of the outer circumference of the coiled slab 4 being wound. The outer periphery of 4 is pressed by the tension applied to the auxiliary sheet 3.
Since the thin plate slab 8 is wound in this pressurized state,
It is wound while being tightened and the winding is wound into a tight coil.

According to the method of FIG. 3, since the thin plate cast piece 8 is placed on the auxiliary sheet 3 and conveyed, it does not break during the conveyance. Further, since the bypass portion 16 is provided, the thin plate cast piece 8 is sufficiently cooled to prevent breakage during winding. Furthermore, since the thin plate cast piece 8 is wound without applying tension, breakage during winding is further prevented. Although no tension is applied to the thin plate slab 8, the coil-shaped slab with tight winding can be manufactured by the method shown in FIG.

[0015]

By carrying out the method of the present invention, it is possible to prevent breakage of a thin plate cast during the transfer of the thin plate cast by continuous casting of the thin plate and to sufficiently cool the thin plate cast during the transfer. Thus, it is possible to prevent breakage of the thin plate slab, which is likely to occur during winding.

[Brief description of drawings]

FIG. 1 is an explanatory view of an example of an apertured metal strip plate, and FIG. 2 is a second view of the present invention.
3 is an explanatory view of an example of the present invention, FIG. 4 is an explanatory view of a normal twin roll type thin plate continuous casting method, and FIG. 5 is an example of a fracture preventing method during conveyance of a slab. FIG.

[Explanation of symbols]

1: Auxiliary sheet supply reel, 2: Auxiliary sheet winding reel, 3: Auxiliary sheet, 4: Coil-shaped slab, 5: Molten metal, 6,6 ': Horizontal roll, 7: Roll gap minimum part, 8: Thin plate casting Piece, 9: Slide table, 1
0: Conveying roller group, 11: Cast slab winding reel, 12: Upper cooling medium injection nozzle, 13: Lower cooling medium injection nozzle, 114: Opening part, 15: Conveying path, 16:
Detour.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiro Morimoto 20-1 Shintomi, Futtsu City, Chiba Nippon Steel Co., Ltd.

Claims (2)

[Claims] 1. An auxiliary device comprising an apertured metal strip plate or a strip-shaped wire mesh between an auxiliary sheet supply reel provided on the inlet side of the slab runway and an auxiliary sheet take-up reel provided on the outlet side of the slab runway. The sheet was run by straddling it, and the slab was placed on the auxiliary sheet and conveyed while being cooled directly by the cooling medium jetted from the cooling medium jet nozzles provided above and below the runway of the slab. , Method for transporting and cooling slab in continuous thin plate casting 2. An auxiliary sheet made of a metal strip is provided between the auxiliary sheet supply reel provided on the inlet side of the slab runway and the auxiliary sheet take-up reel provided on the outlet side of the slab runway. The transport path along the runway and the detour provided below the runway of the slab are connected and formed to stretch and run, and the slab is placed on the auxiliary sheet and above and below the runway of the slab. A method for transporting and cooling a slab in a thin plate continuous casting method, in which it is transported while being directly cooled by a cooling medium jetted from a cooling medium jet nozzle provided in