JPS5947049A - Method and device for casting thin sheet - Google Patents

Abstract

PURPOSE:To cast continuously and stably a thin sheet by injecting molten metal on the internal slope of a horizontal circularly curved surface, rotating the circularly curved surface in the direction opposite from the direction where the molten metal flows down and stripping the solidified metallic shell formed in such a way from the circularly curved surface. CONSTITUTION:Molten metal is injected from an injection device 23 onto the internal slope of a circular drum 21 installed horizontally with an axial line, and the above-mentioned drum 21 is rotated and driven from the outside wall side by a driving device 22 in the direction opposite from the direction where the injection flow 24 thereof falls by gravity in flowing. The drum 21 is cooled by a cooler 30 and the solidified shell 25 formed in such a way is coiled as a cast thin sheet 28 on a coiler 29 via a billet guide device 27. The flow 24 in the above-mentioned device flows along the circularly curved surface and the preceding end 20 thereof flows without deviating from the circumference, thus the stable casting of the thin sheet is made possible. It is also possible to roll or set the section of the shell 25 by disposing a billet rolling device 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for directly casting thin steel sheets.

The conventional method for manufacturing thin steel sheets is to produce a slab with a thickness of 200 = 250 mm by blooming a steel ingot or by continuous casting, and then hot rolling the slab to obtain a blank sheet. It is true.

However, these methods require large-scale hot rolling equipment and energy to heat the slab, so the development of a technology for directly casting thin sheets has become an important issue.

Conventionally, when continuously casting molten steel, a method has generally been used in which the molten steel is poured into a mold, solidified around the cross section, and then pulled out downward. However, with this method (1) it is difficult to cast slabs with a thickness of several tens of centimeters or less due to the relationship between the nozzle diameter and the glue in the mold.

(2) Due to the gap between the slab and the mold, it is difficult to pull it out and raise the height to more than 2 m/m1r1 ψ1
There are problems such as t.

In order to solve these problems and provide an efficient method and device for casting thin plates, the invention and vision have already been filed for patent applications for the following method and device (Japanese Patent Application No. 1888-1982).
8862).

That is, in the method of pouring molten steel and casting a thin plate with an inclined endless track,
yB force direction The direction of the flow of the injection flow is reversed so that the lower end of the flow is self-supported by the surface tension of the molten steel.■ A thin plate casting method and a continuous track driven by a drive wheel. In addition, a belt mechanism having an inclined plane, a means for supplying molten metal downward onto the inclined belt plane, a device for extracting slabs on the upper side of the inclined plane, and a belt mechanism that moves the belt in the upward direction of the inclined plane through a drive wheel. This is a continuous casting and production equipment for molten metal, which consists of a device driven by

In this method and device, molten steel solidifies on a flat surface of the track.
By synchronizing the drawing speed of the solidified shell and the moving speed of the mold, it is possible to prevent the breakout of molten steel due to matting, thereby increasing the drawing speed.

In addition, because of single-sided solidification, the lower surface of the casting piece is in contact with the mold surface, but the upper surface is in contact with the molten steel or air.
Since the upper surface of the mold is not required, no qHc problem occurs in the nozzle arrangement. This application has already been filed +! i1v will be further explained with reference to FIG.

In the figure, 1] J-j casting belt or endless track, 12 is a mold drive wheel, 131 is Tanodinoshi, 14 is unsolidified molten steel, 15 is solidified 1. If, plate 16 is a winding device, and soil 7 is a guide roll or a reduction roll. The molten steel is injected onto the mold surface from 3 and descends the mold surface for a certain distance according to the loca, but since the mold surface is moving northward, in a steady state, the molten steel tip 18 fl is approximately on the mold surface. It comes to rest at a fixed position.The solidified shell develops as it advances from the tip of the molten steel on the mold surface to the point 6 in the figure, and eventually passes through the molten steel surface and becomes a completely solidified thin plate.
Thereafter, it passes through a guide roll or downstream roll 17 and is wound onto a winding device.

By this method, thin plates of about 2 to 20M can be completely manufactured.

As in the above method, the flow direction of the injected molten steel and the drawing direction of the solidified thin plate are reversed.The characteristics of the countercurrent casting method are as follows: (1) The upper surface of the final solidified shell penetrates the molten steel surface. Therefore, the surface texture of the solidified shell on the upper surface is K.

(2) As shown in Fig. 1, the shell thickness has already grown at the position where the molten steel injection flow falls, and the lower surface texture of the solidified shell becomes smooth, improving the durability of the belt.

However, in this method, the molten steel tip position 18 shown in FIG. 1 fluctuates as the operating conditions change, and there is a risk that the tip position will deviate from the inclined straight section and the curvature of the solidified shell will change.

According to the present invention, this problem can be advantageously solved.

The method of the present invention involves injecting molten metal into the slope of the inner surface of a circular curved surface whose axis is horizontal. Continuous casting of thin plate characterized by peeling off the h-f4 solidified metal shell from the inner wall of the circular curved surface and winding it up; this is your method.

According to the method of the present invention, even if the molten steel tip position fluctuates, the molten steel tip position passes the lowest point of the circular curved surface and remains stable without changing to a large rlr in the opposite measurement to the injection position. . Further, since the curvature of the solidified shell thickness is always constant and in close contact with the inner surface of the circular curved surface, casting can be performed stably.

The method of the present invention can be carried out using the following equipment.

That is, +l(1+
A circular drum with a horizontally installed receptacle, an injection device for injecting molten metal onto the slope of the inner wall of the drum, a drive device that rotates the drum from the outer wall of the drum in a direction opposite to the injection flow, and a drum. This is a continuous thin plate casting apparatus for molten metal consisting of a cooling device for cooling and a winding device for winding up solidified nonyl formed on the inner wall of the drum. In this case, the inner wall of the drum is the inner wall of the circular curved surface.

A specific example of this device is shown in FIG. The cylindrical drum 2 is driven by a drive device 22 in a direction opposite to the flow direction of the injected stream 24 from the injector. The surface of the solidified shell 25 is smoothed by a slab rolling device 26, and then passed through a slab guide device z7 and wound up by a winding device 29. −? The ζ1 cylindrical drum is cooled by a cooling device 30. Since the injected flow flows along an arc, the tip 20 is never to the left of the lowest point of the cylindrical drum and becomes stable.

Furthermore, the method of the present invention can be carried out using the following equipment. That is, a metal belt having a circularly curved surface whose axis is horizontal, an injection device for injecting molten metal into the upward slope of the inner surface of the 11,76 circularly curved surface formed by the metal belt, and the metal belt as a flow of injection flow. A drive device that drives the metal belt in the opposite direction, a guide roller that keeps the trajectory of the metal belt in an arcuate shape, a cooling device that cools the belt, and a roller that winds up the solidified shell formed on the inner wall of the circular curved surface. This is a continuous thin plate casting device for molten metal, which consists of a winding device.

A specific example of this device is shown in FIG. Here, instead of the cylindrical drum 21 shown in FIG. 2, a metal belt 31, a part of which is guided with a circularly curved surface, is driven by a belt drive roll 32. The belt guide rolls 33 are arranged in an arc shape. The AA' section of this figure is shown in FIG. Metal belt) 31id:, its both ends are held by guide rolls 33, and an injection flow and a solidified shell are generated at the center of the width of the metal belt.

The method of the present invention can still be carried out using the following equipment. That is, the shape of the cut surface by the plane including the axis of the circular drum has a flange-like shape with both ends protruding in the 11+11 direction of the center, so that the width of the flow can be controlled. It is equipped with J191.

This device is shown in FIG. Figure (I) shows the end face of the cut portion in a plane that includes the axis of the circular drum, and has flanges 51 at both ends to regulate the width of the thin plate.

The method of the present invention can be carried out using the following equipment. That is, it is a device in which a fixed weir is provided at the edge of the flow of molten metal.

As shown in FIG. 6, fixed ridges 62 are provided at both ends of the cylindrical drum 6 metal belt 2). The contact portion 63 is in close contact to prevent molten steel from being inserted.

The shredding method of the present invention can be carried out using the following equipment. That is, this is a device in which a weir that moves at the same speed as the circular curved surface is disposed at the edge of the flow of molten metal.

FIG. 7 shows a specific example of this device, in which a cylindrical drum or metal bell 71 is driven by a drive device 72, and a synchronous weir 73 is installed inside the drive device 72 at the same speed as 71.
It is driven by a separate drive device. By doing this, the metal belts 7 can be made cheaper (C) and can be made expendable compared to the case where a collar or a fixed weir is provided.

However, the method of the present invention also includes the case where it is carried out without placing a weir at the edge of the molten metal. In this case, as shown in FIG. 8, the width of the cylindrical drum or metal belt 810 is greater than the width of the molten metal stream. The molten steel flow is self-retained by the surface tension of the side edge portions 82.

Further, when the injection flow rate is larger than the rotational speed, a molten steel pool 92 is formed near the lowest point of the cylindrical drum, as shown in FIG. When casting a relatively thick plate, it is advantageous to actively create a reservoir in this way. In this case, the drum needs to have a flange as shown in 91.

As described above, by using the method and device of the present invention, the tip of the injection flow is made to flow along a circular curved surface (arc), and the tip of the injection flow is stabilized without any force applied to the circumference. becomes possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram (X'/', top view) of a conventional method and apparatus. FIGS. 2 to 9 are explanatory diagrams of embodiments of the method and apparatus of the present invention, and 2.3. Figures 7 and V1 are elevational views, Figure 4 is a cross-sectional view taken along line A-A' of Figure 1, Figures + and J are cross-sectional views along the plane that reads the axis of the circular drum, and Figure 61 is a cross-sectional view taken along the plane that reads the axis of the circular drum. A sectional view illustrating a state in which a fixed weir is installed at the edge of the flow of molten metal, and FIG. 8 is a sectional view of another embodiment in which a weir is not provided at the J-non portion. 11... Casting belt, 12-... Mold drive wheel, 1;
Ukundinoshu, 14...Unsolidified molten steel, ■5.・・・
Solidified thin plate, 16... Winding device, 17... Guide roll (downstream roll), 18. Molten steel tip, 20 - Inflow 1τ:゛ Tip, 21... - Cylindrical drum, 22... Drive device, 23 -・Injection device, 24・Injection flow, 25...
Solidified shell, 26... Slab rolling device, 27... Slab guiding device, 28-... Cast thin plate, 29... Winding device,
30. - Cooling device, 31... - Metal heald, 32... Belt drive roll, J+3... Belt guide roll, 51
... Cylindrical drum side collar, 61... Cylindrical drum (or belt), 6z... Fixed weir, 63... Contact surface, 71
-- Cylindrical drum (or belt), 72 -- Cylindrical drum or belt drive device, 73 -- Synchronous weir, 74 --
11 Drive device of synchronous weir, 81... Cylindrical drum or belt, 82... - Molten steel flow III edge surface, 91...
Cylindrical drum with flange, (92... - molten steel reservoir. Patent applicant Shin [1 Wooden ((・K Co., Ltd. agent)
Patent attorney Inoue□lit student Figure 5 (1) 163 Figure 7 1 Figure 8 Figure 9 Procedural amendment 01τ=r+ 1981 11q ++ Commissioner of the Patent Office Kazuo Wakasugi ■, case display 1988 Patent Application No. 1.574992, Name of the invention Thin plate casting method and apparatus 3, Relationship with the person making the amendment Patent applicant address 3.1q, 2-1-16 Otemachi, Chiyoda-ku, Tokyo
Name (665) Representative of Nippon Steel Corporation a
lTl! 4. Agent 240-01 Address 1 Nagara, Hayama-machi, Miura-gun, Kanagawa Prefecture [101-6]
3 (1) Page 6 of the specification, lines 7-8 [Durability of the belt due to growth and smooth bottom surface texture of solidified shell" in 1. Since there is no collision, the surface texture of the F surface of the solidified shell becomes smooth and the durability of Bell I.'' is corrected.

Claims (7)

[Claims] (1) Molten metal is injected into the slope of the inner surface of a circular curved surface whose axis is horizontal, and the molten metal is rotated in a circular direction in the opposite direction to the direction in which the molten metal flows down due to gravity. A method for continuous casting of a thin plate, characterized in that a solidified metal shell is peeled from four circularly curved inner walls and then rolled up. (2) A circular drum installed horizontally, an injection device for injecting molten metal onto the slope of the inner wall of the drum, and one nuclear drum in the opposite direction to the injection flow. A molten metal thin plate series U1-casting apparatus ρ consisting of a drive device that rotates from the outer wall of the drum, a cooling device that cools the drum, and a winding device that takes up the entire solidified shell formed on the inner wall of the drum. (3) a metal belt having a circularly curved surface with a horizontal axis;
4- of the inner surface of the circular bend 11 formed by the metal belt.
An injection device for injecting molten metal into a slope facing the direction, a drive device for driving the metal belt in the opposite direction to the flow of the injection flow, a guide roll for keeping the trajectory of the metal belt in an arc shape, and the belt. An apparatus for continuous casting of thin sheets of molten metal, which comprises a cooling device for cooling the l-f and a winding device for winding up the solidified shell formed on the inner wall of the circular curved surface. (4) Claim (2) has flanges formed at both ends of the circular drum to protrude in the direction of the central axis along the circumference so as to be able to regulate the width of the flow of molten steel. The device described in. (5) The device according to claim (2) or (3), wherein a fixed weir is provided at the edge of the flow of molten metal. (6) The device according to claim 2, sludge holder, and 3), wherein a weir that moves at the same speed as the circular surface is provided at the edge of the flow of molten metal. (7) Claims (2), (1) and (3) are characterized in that a rolling mill for rolling or straightening the cross section of the solidified shell is provided upstream of the winding device. equipment.