JPS6087957A - Apparatus for casting continuously thin metallic sheet - Google Patents

Abstract

PURPOSE:To cast continuously a thin metallic sheet which is thinner than in the prior art with a belt caster provided with stationary type short-side casting molds by pouring continuously a molten metal to the belt casters through the opposed nozzle holes of the side gates in the upper part on the short sides. CONSTITUTION:A molten metal 6 in a tundish 10 is poured 6 to the side gates provided in the upper parts of short side casting molds 7, 7' and is poured through nozzle holes 14 to the space between belt casters 4 and 4', by which a continuous casting ingot 5 is formed. There is no immersion nozzle like in the prior art above the casters 4, 4' and since the molten metal is poured through the holes 14, the width between the casters 4 and 4' is made extremely small. The production of the extremely thin casting ingot for the metallic strip is made possible and the succeeding rolling state is made shorter, by which the cost of the thin sheet is reduced.

Description

[Detailed description of the invention] [Technical field of the present invention] The present invention relates to an apparatus for continuously casting thin metal sheets.

[Background technology]

In recent years, as part of the rationalization of rolling operations, for example, rolled materials (hereinafter referred to as slabs) are being supplied to hot strip mills.

) Slab materials produced by continuous casting equipment (hereinafter referred to as continuous casting slabs) are often used. In this case, the thickness of the continuous cast slab should be set close to the thickness of the final hot strip product.
By supplying a material with a thinner wall thickness, it is possible to omit extensive rolling steps including a rough rolling step and save energy, and further streamlining of the rolling operation can be expected. For this reason, the following continuous casting apparatuses for thin metal sheets (Conventional Apparatus Example 1 and Conventional Apparatus Example 2) have been proposed.

[Conventional Device Example 1] FIG. 1 is a schematic front sectional view of a main part of conventional device Example 1, and FIG. 2 is a view taken along the line A--A in FIG.

This device is called a vertical belt caster, and as shown in the figure, a belt 2.2' made of heat-resistant band steel or the like is wrapped around a plurality of pulleys 1.1' in an endosystem, and
A pair of left and right vertical belt casters 4, 4', which are driven to rotate synchronously in opposite directions and are configured to attach a 3ft water cooling device to the descending portion, are installed in parallel, and the belt 2.2' The gap T between the vertical surfaces of is arranged so as to correspond to the required thickness of the slab 5. Said belt 2.2
At both ends of the vertical plane of the belt 2, there is a molten metal [hereinafter referred to as molten metal 6] in a space formed by the belt 2.2'. ] A pair of short side molds 7 and 7' are arranged side by side in the vertical direction to prevent the liquid from flowing out to the outside. The dandelion mold 7.
The molten metal 6 is continuously supplied at a constant rate into the space formed by the belt 2.2' and the belt 2.2', and is cooled by contacting the surface of the belt 2.2', thereby forming a thin plate slab of the required thickness ( slab material)
5.

[Disadvantages of Conventional Device Example 1] However, in the device of Conventional Device Example 1, the minimum dimension of the belt gap T between the belt casters 4, 4' is limited due to the structure and dimensions of the submerged nozzle 9. That is, the immersion nozzle 9 usually requires a gap of at least about 10 cm to ensure the fluidity of the molten metal, and also the required wall thickness and the space between the nozzle outer periphery and the belt 2.2' for the strength of the nozzle. It is necessary to ensure a minimum clearance to prevent wear due to contact between the cast members and the thickness of the cast slab. Therefore, this conventional apparatus example 1 has the disadvantage that the thickness of the slab is limited by the outer diameter of the immersion nozzle 9, and a slab thinner than this cannot be obtained.

[Conventional device example 2] FIG. 5 is a schematic front cross-section of the main part of conventional device example 2.

This device is called an inclined belt caster, and as shown in the figure, the bells are driven to rotate synchronously in opposite directions.
A pair of upper and lower belt casters 4a consisting of 2a and 2a'
, 4a'i, determine the gap T' between the parallel opposing surfaces of the belts 2a and 2a' to correspond to the required thickness of the slab 5,
In addition, it is arranged at an appropriate inclination with respect to the horizontal plane. Tandetsu 7
The molten metal 6 in the cup 8a flows from the tumbler tube nozzle 9a, which has a trough-like cross section, to the belt 2a of the lower belt caster 4a'.
As in the above-mentioned conventional device example 1, it is continuously injected into the space formed by the side short piece molds 7a, 7a' and the bell) 2a, 2a', and the required thickness is v, and one piece 5 It manufactures. In addition, the water cooling device for belt 3a is shown in the figure. In this device, since the tongue push nozzle 9a is not inserted between the upper and lower belts 2a and 2a', the gap T'z between the belts 2a and 2a' can be freely reduced, and the minimum thickness is about 20 mm. It is possible to manufacture thin fishing pieces.

[Disadvantages of Conventional Device Example 2] However, in the device of Conventional Device Example 2, the molten metal 6 from the tongue push nozzle 9a flows down on the lower belt 2a' and onto the free surface of the molten metal between the belt casters 4a, 4a'. Because of the pouring, the surface of the cast slab becomes uneven and the surface quality deteriorates, which is a very serious drawback.

[Object of the present invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a continuous thin metal sheet casting apparatus that can eliminate the drawbacks of the conventional apparatus examples 1 and 2 and produce thin slabs with smooth surfaces.

[Configuration of the present invention]

As a means for achieving the above object, the present invention provides a pair of immersed nozzles on both sides of the bottom of the tongue pusher, and a pair of side weirs arranged at the bottom corresponding to the pair of immersed nozzles. In addition, this side weir is composed of an L-shaped body having a nozzle hole on its opposite side. That is, the present invention provides a belt caster equipped with a fixed side short piece mold, in which a pair of immersion nozzles are provided on both sides of the bottom of the side short piece mold, and a pair of side nozzles are fixedly installed horizontally opposite to each other on both sides of the upper part of the side short piece mold. connected to introduce the molten metal in the tank pusher,
Further, the side weir is formed into a substantially L-shaped body having an open upper part and a nozzle hole on the opposite side, and the molten metal in the side weir is directed to the nozzle hole. This is a continuous casting machine for thin metal sheets, characterized in that the metal is continuously injected into the belt caster through the belt caster.

The present invention can be applied to both vertical 1σ type belt casters and inclined type belt casters l), and by performing pressure pouring for pouring hot water, it is possible to supply hot water with a much higher quality. .

Hereinafter, the present invention will be explained in detail based on FIGS. 4 to 6, taking as an example the case where the present invention is applied to a vertical belt caster. FIG. 4 is a front sectional view of a continuous thin metal plate casting apparatus according to an embodiment of the present invention, FIG. 5 is a sectional view taken along the line B-B in FIG. 4, and FIG. A line cross-sectional view,
The structure of the side weir is shown. In Figures 4 to 6, 1 to 6
The same parts as the conventional device shown in FIG. 6 are given the same numbers. Therefore, to explain the common features with the conventional device examples 1 and 2 described above, as shown in FIGS. 4 to 6, a pair of circular cross-section An immersion nozzle 11 is provided vertically, and at the bottom thereof,
A pair of left and right side weirs 13 and 13' are fixedly fixed to the base 12 and lined with a refractory material so as to temporarily store the molten metal 6 flowing out from the nozzle 11. Then, the immersion nozzle 11 is installed so that the lower end of the nozzle 11 is immersed below the level of the molten metal in the side weirs 15 and 16'.

Each side weir 13, 13' forms an L-shaped cylindrical body, and is in close contact with the upper surface of the side short piece mold 7, 7', respectively,
They are arranged symmetrically facing each other inwardly, with a large opening at the top and a plurality of rows of nozzle holes 1 in the upper and lower directions at the side ends.
Side wall portion 15.1 with a rectangular cross section formed by substantially horizontally perforating 4.
5'i, and the opposing end surfaces of the side pieces 15 and 15' match the inner surfaces of the side short piece gun shapes 7, 7', and the belts 2, 2 are integrally formed with the short piece molds 7, 7. The belt 2.
The side wall portion 15°15' is removably inserted and fixed into the gap 2'.

In the apparatus configured as described above, the bath water 6 in the tongue pusher 10 is supplied to the fixed side dam 1 through the immersion nozzle 11.
3 and 13', and after temporarily staying there, it flows from the nozzle hole 14 to the belt casters 4 and 4'. In this case, the flow rate of the molten metal 6 from the immersion nozzle 11 is adjusted by a flow rate adjustment device (not shown), so that the side weir 1!1.1! It is possible to continuously keep the molten metal level in l' at a predetermined level and to keep the molten metal level in the belt caster constant.

In addition, the hole diameter and number of nozzles 14 are limited by the thickness of the slab (2+), and the thickness T is limited by the minimum diameter of the nozzle 14, but in terms of structure and strength, it is wider than the immersion nozzle type of conventional device example 1. It is possible to make the thickness of the slab thinner, and it is extremely easy to obtain a slab with a thickness of about 20 m using the apparatus of Conventional Equipment Example 2.

Furthermore, in the apparatus of the present invention, the head of the molten metal 6 in the side weirs 13, 13' is used to pour the molten metal into the bell I caster, so the molten metal is poured below the liquid level, which is different from the conventional apparatus examples 1 and 2. In comparison, it is now possible to stably obtain slabs with even better surface properties, and this greatly contributes to the rationalization of rolling operations, along with the substantial omission of the rolling process using thin slabs and the energy-saving effect.

[Effects of the present invention]

As described in detail above, in the present invention, a pair of immersed nozzles are provided on both sides of the bottom of the tongue pusher, and a pair of side weirs made of a b-shaped part having a nozzle hole on the opposite side are provided at the bottom thereof. It is something that Therefore, in the present invention, since the immersion nozzle is not immersed in the molten metal between the belt casters as in the conventional apparatus example 1, it is possible to produce even extremely thin wj pieces. Moreover, the present invention
Since the molten metal is not injected into the free surface of the molten metal between the belt casters as in Conventional Apparatus Example 2, it is possible to obtain a slab with a smooth surface.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional device using a vertical belt caster, and FIG. 2 is a view taken along the line A--A in FIG. FIG. 3 is a front sectional view of a conventional device using inclined belt casters. Fig. 4 is a front sectional view of a continuous thin metal plate casting apparatus which is an embodiment of the present invention, and Fig. 5 is a
FIG. 6 is a cross-sectional view taken along line a-a in FIG. 4, showing the structure of the side weir. 1, 1'+++ pulley 2, 2', 2a, 2a'...Belt 6.3a.
・・Water-cooled jfif 4, 4', 4a, 4a' ・・Belt caster 5
... Slab 6 ... Molten metal 7.7' ... Short piece mold 8, 8a, 10 days, tumble push 9.11 ... Immersion nozzle 9a ... Tandetsunyu nozzle 12...Base 13.15'...Side weir 14...Nozzle hole 15.15'...Side wall T, T'...Gap between belts 1 Figure rod 2 Figure 4 Procedural Amendments 1982 fl: November 1 (Japanese Patent Office Commissioner Kazuo Wakasugi 1, Indication of Case 1982, 111.
IJI (7) Name 7; 1; Continuous metal sheet casting equipment 3
, Relationship with the tenant who makes the correction 1"+'if'1111'+I41'i
Person II Address: 2-5-1 Marunouchi, Chiyoda-ku, Tokyo 4.
1 Agent 11111 Bundle; [Bengang-ku Tora)mon-Ding 1116 Total 2-
(
5011184+ Number 4 Name Itori: (717
9 + 1 勺 1 (1 Ming (and 1 other person) 5. Date of amendment order Voluntary amendment 6, 1'! Number of inventions increased by amendment None l Target of amendment "Mei 18" a Details of the amendment The last line of page 7 of the book (displays the page) [7] Correct the entry J to r (6) j, and change the following pages to r (8).
J to r (7) J, r < 9) J to r
(8) To J, "Katsu 1" in September, r Q
l) J to “scream”, “(6)” to “al”, “U”
” is corrected to “(b)”.

Claims (1)

[Claims] In a belt caster equipped with a fixed short side mold, a pair of immersion nozzles are provided on both sides of the bottom of the tongue pusher, and a pair of side nozzles are fixedly installed horizontally opposite each other on both sides of the upper part of the short side mold. The side weir is connected to the weir so as to introduce the molten metal in the tongue push, and the side weir is entirely formed into a substantially L-shaped body having an open upper part and a nozzle hole on the opposite side, so that the molten metal in the side weir is connected to the weir so as to introduce the molten metal in the tongue push. A thin metal sheet continuous casting apparatus, characterized in that: is continuously injected into a belt caster through the nozzle hole.