JPH01157748A - Cassette type weir in tundish for continuous casting - Google Patents

Abstract

PURPOSE:To reduce running cost and to improve the cleanliness of molten metal by forming weirs as fixable/removable to a tundish with beam member fixed-supporting weir plates and top parts thereof. CONSTITUTION:The weir 2 as fixable/removable is constituted with the refractory-made weir plate 3 and the top part supporting beam member 5, and the side face 3a of the weir plate 3 is almost abutted on the inner face of the side wall 1a in the tundish 1, so as to cut off the inner part of the tundish 1 to longitudinal direction. Further, a cutoff part 4 is arranged at lower part of the weir plate 3, and the top part thereof is fixed with the beam member 5 to support both end part of the beam member 5 with cutout 6 in the side wall 1a of the tundish 1. The upper part of the side wall and the beam member 5 are pressed with a tundish cover to execute casting. As the weir plate 3 is taken out and made to fixable and it can be reused, the running cost is reduced, and further, as the slag removal is sufficiently executed, the cleanliness of the molten metal is improved.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a weir for a kundish for continuous casting of molten metal;
In particular, it relates to a reusable cassette residual layer that is easy to attach, fix, and remove.

<Prior Art> A kundishu used when pouring molten metal in a continuous casting method plays a very important role from the viewpoint of cleaning the molten metal by floating non-metallic inclusions therein. From this point of view, the size and capacity of tundishes have recently been increasing in order to lengthen the average residence time from when the molten metal is received from the ladle until it is discharged from the tundish nozzle into the mold. , Furthermore, in order to float and separate non-metallic inclusions and obtain a clean molten metal, for example, the ninth
Various types of weirs are installed in some areas, as shown in Figures (a) and (b) and Figures 10 (a) and (b). That is, FIGS. 9(a) and 9(b) are a plan view and a cross-sectional view, respectively, showing an example of a conventional weir.
1a is a tundish side wall, 1b is a tundish bottom wall, 18 is a molten metal receiving part from a ladle, 19 is a kundish nozzle, 22 is an upper weir, 23 is an upper weir, and 24 is provided at an upper weir and an upper weir. It is a tunnel. Also, Figure 1O(a)
, (b) are a plan view and a sectional view, respectively, showing another example of a conventional weir, in which 25 is a porous layer with many small diameter through holes in the part immersed in the molten metal, and 26 is a tundish of the porous layer 25. This is a stacking part for fixing a porous weir that is stacked along the side wall surface of the tundish, with the end portions in contact with the side walls 1b on both sides in the width direction being sandwiched from both the front and back sides.

Normally, these weirs are built so that they are integrally joined to the inner surface of the side wall or bottom wall of the tundish with refractory mortar to prevent them from collapsing or floating during pouring of molten metal.

When constructing a structure using these weirs and fire-resistant bricks, it takes time and the skill of the workers to stack each brick one by one. Precast blocks, etc., which are cast into large blocks in advance, are also used. However, even when such an integrated weir constructed from precast blocks is incorporated into a tundish, there are several methods to prevent the weir from collapsing or floating up, such as: 1) Joining it to the inner wall of the tundish with fire-resistant mortar, 2) As shown in Figure 10. The method used was to lay bricks for fixing, which still took time and effort to construct. Furthermore, it was not possible to completely prevent the weir from collapsing or rising.

Furthermore, if a weir is provided that is connected to these side walls and bottom walls of the tandish, it is impossible to deal with sudden changes in the tandish weir specifications that are occasionally required in a short time.

<Problems to be Solved by the Invention> The present invention solves the problems of conventional tundish weirs that are built integrally with the side walls and bottom walls of the tundish as described above, and by forming them integrally in advance and/or It can be assembled, and can be easily and quickly fixed to and removed from the tundish, and can be suddenly required due to unplanned changes in the type of cast steel that may cause problems such as falling or floating during casting. Changes in Tanditsh weir specifications can be dealt with in a short time.
It was also designed to provide a cassette-type platform for continuous casting tundishes that can be easily removed and reinstalled after use.

<Means for Solving the Problems> As a result of extensive studies in order to solve the problems of the conventional Tanditshu internal weir, the inventor of the present invention has achieved the objective by using a cassette type weir plate of the required shape and structure. We have found that this can be achieved, and based on this knowledge, we have completed the present invention.

The present invention has the advantage that when placed in a tundish,
It consists of one or more weir plates provided so as to form a molten metal flow path together with a part of the inner bottom surface of the tanditshu, and a head fixing support beam member that fixedly supports the heads of these weir plates, This is a cassette-type platform for a continuous casting tanditshu that is fixed to the tanditshu via fixed support parts on the upper portions of both side walls of the tanditshu and can be removed at will.

Effects> Since the tundish of the present invention has the above-described structure, it has the following effects.

(1) It can be molded or assembled in one piece in advance, will not collapse or float during casting, does not need to be integrated with the side wall or bottom wall of the tundish, and can be easily attached to and removed from the tundish. It is extremely easy and can be done in a short time.

(2) Since a molten metal flow path is formed together with at least a part of the bottom surface of the tundish, the remaining molten steel and slag in the tundish at the end of casting are allowed to flow through this flow path to the tundish nozzle or the remaining molten steel formed elsewhere. Since the slag and slag can be discharged from the discharge port to the outside of the tundish, it is possible to prevent the bottom of the weir plate from becoming integrated with the solidified molten steel and slag remaining in the tundish, and the weir can be easily removed and reused. Become.

<Specific structure and embodiments of the invention> The specific structure of the present invention is based on an embodiment shown in FIGS. 1(a), (c), and (C) and FIGS. explain.

Figure 1 (a), (b), (C), Figure 2 (a),
In (b), 1 is Tanditsh, 7 is its iron skin,
La is the side wall of the tundish, and lb is the bottom wall of the tundish, both of which are made of refractory material. Reference numeral 2 is a cassette-type platform of the present invention, and reference numeral 3 is a refractory weir plate thereof, which is integrally formed of castable refractory material. When the side surfaces of the refractory weir plate No. 3 are set in the tundish as shown in FIG. The bottom surface 3b is in contact with or close to the inner surface of the bottom wall of the tundish, thereby blocking the interior of the tundish.

However, the lower corner of the refractory weir plate 3 is provided with a notch 4 that forms a flow path for molten metal, and the molten metal that has fallen from the ladle to the molten metal receiving position 18 is
It flows as shown by the arrow in Figure (a) and is cast from the tundish nozzle 19 into a mold not shown in the drawing.

In addition, the refractory material of the refractory weir plate is selected from neutral refractories (high alumina refractories), basic refractories (magnesia refractories, When casting a low melting point non-ferrous metal, an appropriate one may be selected from heat-resistant metals.

Reference numeral 5 denotes a head fixing support beam member that fixedly supports the head of the refractory weir plate, and in this embodiment, a reinforcing bar as shown in FIGS. Consists of a castable refractory block that is integrally molded with a plate. These head fixing support beam members 5 extend parallel to both side walls 1.
a, and its both ends are fitted into a notch 6 provided at the upper end of the side wall 1a of the tundish and having a width and depth slightly larger than the longitudinal section of the fixed support beam member 5. Supported. Although not shown, a tundish lid is usually placed on the upper part of the side wall of the tundish, and presses down the fixed support beam member from above. In this way, both ends of the fixed support beam member 5 are fixed and pressed by the notch 6 and the lid of the tundish, so that the remaining cassette layer 2 will not fall due to collisions or buoyancy of the molten metal flow during casting. It will not float up and impair the function of the weir.

The method of using the remaining cassette layer having the above structure will be described below.

(2) The head fixing support beam member 5 integrally molded with the refractory weir plate 3 is air-dried and heated to thoroughly remove moisture.

■ Use a crane or other handling machine to hang the cassette remaining layer 2 inside the tundish 1, which has undergone repairs and other preparations for the refractories on the side walls, bottom walls, etc., and attach both ends of the head fixing support beam member 5 to the tundish 1. Fit into the notch 6 in the side wall of No. 1 and set.

■ Place the tanditsu lid on the top of the tanditsu side wall.

■ Thoroughly preheat the tanditshu along with the remaining layers of the cassette.

(2) Casting the molten metal using the tundish.

(2) After casting the molten metal, all the molten metal and slag remaining inside the tundish are discharged to the outside through the notch 4 and the tundish nozzle 19.

■ Remove the lid of the tanditshu.

■ Using a crane or other handling machine, remove the remaining cassette layer 2 from the tundish, remove the stuck slag, etc., and then inspect the outside to determine whether it can be reused.

■ The remaining reusable cassette layer is charged into a heat retention furnace or slow cooling furnace, where it is kept warm or slowly cooled in preparation for next use. Note that items that can be reused after being partially repaired are either hot repaired or once cooled and repaired in preparation for reuse.

Modifications of the present invention will be described below with reference to the drawings.

The one shown in FIGS. 2(a) and 2(b) is one in which the refractory weir plate 3 of the cassette remaining layer 2 and the head fixing support member 5 are integrally molded with reinforcing bars 8 inside. In the one shown in FIGS. 3 and 4, the head fixed support beam member 5 has a steel box structure so that the inside can be cooled with fluid (air cooling or water cooling), and the inside of the box is separated by a cooling fluid partition plate 13. A cooling fluid supply pipe 11 communicating with the outward route and a cooling fluid discharge pipe 12 communicating with the return route are fixedly installed at one end of the zero head fixed support beam member 5 that partitions the outward route and the return route. In addition, a through-hole is provided in the head of the refractory weir plate 3 through which the head fixed support beam member 5 passes, or the head fixed support beam member is cast in a castable refractory and integrated. The refractory weir plate 3 may be formed so as to have the following shape.

In addition, the refractory weir plate 3 of this modification example has a tundish 1
The shape and dimensions are determined so that when set in the tundish at a predetermined angle with respect to the width direction of the tundish, the side surfaces and inner surface of the tundish are in contact with or close to the inner surface of the tundish (see Fig. 3 (C)). A cylindrical through hole 9 is provided in a part of the lower corner of the tundish, and a small notch 4 for draining hot water is provided in the center of the lower end. As shown by the arrow, molten metal flows from the molten metal receiving part in the tundish in a zigzag pattern and is injected from the tundish nozzle 19 into a mold not shown in the drawing.

In addition, the head fixing support member 5 of the cassette-type platform 2 of this modification example
extend beyond the side walls 1a on both sides of the tundish to the outside, are placed on the upper ends of the tundish side walls, and are sandwiched between a pair of supporting hardware lO fixed to the tundish side wall iron skin 7. Both ends of the head-fixing support beam member 5 are firmly held to the support hardware 10 with bolts (not shown), so the cassette platform 2 will not fall or float due to collisions with molten metal flows or buoyancy. In addition, the head fixing support beam member 5 can be fixed without using bolts as described above, but by devising the side end of the commonly used tundish lid and pressing the head fixation support beam member from above. Even if you do this, you don't have to worry about it falling over or lifting up, like when you fix it with bolts.

Further, it is necessary to flow a cooling fluid (air or water) into the head fixing support beam member 5 for internal cooling. In this way, even if the refractory blocking member 3 is damaged and cannot be reused, only that part needs to be replaced with a new one, and the head fixing support beam member 5 can be reused for a long time. Is possible.

FIG. 5(a), Φ) is a detailed view showing another modified example of the cassette-type platform of the present invention, (a) is a front sectional view, and (c) is a
) is a GG visual survey surface diagram. In FIGS. 5(a) and 5(b), the refractory weir plate 3 is integrally molded with castable refractory material with reinforcing bars 8 and a portion including the heads of bolts 14 buried inside. numeral 4 is a small notch for draining hot water, and numeral 5 is a head-fixing support beam member made of a steel box.

A cylinder through which the bolt 14 passes is welded to this steel box so as to pass through the box vertically,
Furthermore, in order to fluidly cool the inside as in the above-mentioned modification, the partition plate 13 that forms the outgoing path and the incoming path inside is installed with a gap 17 provided so that the outgoing path and the incoming path communicate with each other at one end. At the other end, a cooling fluid supply pipe 11 and a cooling fluid discharge pipe 12 are attached, which communicate with the outgoing path and the incoming path, respectively.

The refractory weir plate 3 is constructed by inserting a bolt 14 whose head is partially embedded into the through hole (cylindrical) 20 of the head fixed support beam member 5 with a spacer 16 in between, and then inserting the bolt 14 into the through hole (cylindrical) 20 of the head fixed support beam member 5. It is fixed integrally with the head fixing support beam member 5 by screwing a nut 15 into the head. With this configuration, the number of refractory parts of the cassette platform 2 is reduced, and the other parts can be used for a long period of time, which has the advantage of reducing running costs.

In addition, the number of small diameter through holes 2 of the refractory weir plate 3 of this modification is
1. The surrounding material should be a high CaO content basic refractory such as calcia or dolomite, and two or more pieces with different placement positions of the small diameter through holes 21 should be placed in the tundish at appropriate intervals. Ba, CaO・/V! Due to the absorption effect of Al z O3 in molten steel due to the generation of low melting point compounds of Os, it can function as a filter for removing non-metallic inclusions. It is also possible to quickly replace the entire cassette platform 2 during installation.

Figure 6 (a), (b), (C), (d), (e
) shows another modification of the tsukaset-style clothing of the present invention set in a tanditsu 1.

Figure 6(a) is a plan view, Figure 6Φ) is the J of Figure 6(a).
-J cut cross-sectional view, Figure 6 (C), (d), (e) are respectively ni-, ni'-, and L-L of Figure 6 (a).
, L'-L' view, M-M, M'-M' perspective view.

The one shown in Figure 6 (C) has a notch (channel) in the center of the bottom.
The side surface 3a and bottom surface 3b of the weir plate 3, which has a U-shaped notch (overflow channel) in the center of the upper part, are brought into contact with or close to the inner surface of the tundish side wall 1a and the bottom wall 1b, respectively. As shown in the modified example of FIG.
20) in the figure vertically, and fixedly supported by sandwiching the beam member 5 from above and below between a spacer 16 fitted to a bolt 14 and a nut 15. Also, Figure 6(d)
The one shown in FIG.
A predetermined space 28 is formed between the inner bottom surface of the bottom wall 1b of the tandish, and the head of the weir plate 3 is fixed to the head fixing support beam member 5 using fixing means as in the modification shown in FIG. It is something that has been supported.

The one shown in FIG. 6(e) is formed so that the side surface 3a of the weir plate 3 is in contact with or close to the lower part of the inner plane of the side wall 1a of the tandish, and a notch (channel 4) is provided at the lower corner. At the same time, L-shaped notches (overflow channels) are provided on both sides of the upper part of the weir plate, so that the head at the center of the weir plate 3 is fixed to the head fixing support beam member 5 by the means shown in FIG. It is supported.

The cassette-type platform shown in FIGS. 6(C), (d), and (6) is arranged as shown in FIGS. 6(a) and (b), and the supporting hardware 1
If the molten metal that falls from the ladle to the molten metal receiving position on the 1st day is bent by the weir plate in the direction of the arrow shown in the figure, it will be bent by the weir plate in the direction of the arrow shown in the figure. While flowing, tanditshu nozzle 1
From 9 onwards, it is poured into a continuous casting mold (not shown).

FIGS. 7(a), 7(c), and 7(d) show still another modification of the cassette platform of the present invention set in the tandish 1. Figure 7 (a) is a plan view, Figure 7 (b) is (a) (7) N, -N cross-sectional view, (C) is P-P cross-sectional view of (a), and (d) is This is the Q-Q recovery in (a). The cassette platform shown in FIGS. 7(C) and (d) has a side surface 3a and a part of the bottom surface 3b facing one side surface of the weir plate which is in contact with or close to the inner surface of the tundish side wall 1a and bottom wall 1b, respectively. A predetermined lateral space 30 is formed between the inner surface of the side wall of the weir plate, and the head of the weir plate is made of reinforcing reinforcing bars (similar to the cassette type platform shown in Figure 2 (al) and (bl). (not shown) and is molded integrally with the head fixing support beam member 5.Both ends of the head fixing support beam member 5 are held between notch guides 6 provided at the upper end of the tundish side wall 1a. Then, use the tundish lid (not shown) to press it downward.

By arranging the remaining layer of the cassette of this modified example as shown in FIGS. 7(a) and (5) in this manner, the molten metal falling to the molten metal receiving position 1B in the center of the tundish is transferred to the weir plate side space 30. The material flows through the flow path as shown by the arrows in FIG. 7(a), and is cast into a mold (not shown) through tundish nozzles 19 provided at both ends in the longitudinal direction.

8(a), 8(b), and 8(c) are diagrams showing a situation in which yet another modification of the present invention is arranged in a tundish l; FIG. 8(a) is a plan view; FIG. 8(a) is a plan view; (b) is Fig. 8(a)
8 (C1, (d) are respectively S-s, s'-s', s"-s', 5 of FIG. 8(a)
=-s-cut sectional view and T-T, T'-T' sectional views. The cassette platform 2 shown in FIG. 8(a) has a bottom surface 3b in contact with or close to the inner surface of the tundish bottom wall 1b, and a space 30. configured to form 30;
The head of the weir plate 30 is integrally molded and fixedly supported by the head fixing support beam member 5, similar to the cassette type platform shown in FIGS. 2(a) and 2(b).

In the case shown in FIG. 8(d), the side surfaces 3a, 3a on one side of each of the two weir plates 3.3 are the side walls 1a of the Kundeitshu.
The bottom surface 3b is in contact with or close to the inner surface of the bottom surface 3b.

3b is also in contact with or close to the inner surface of the tundish bottom wall 1b. Side faces 3c, 3c on the widthwise center side of the tundish of the two weir plates 3.3 face each other with a predetermined interval, and form a space 31. The heads of the two weir plates are integrally formed with one head-fixing support beam member 5, similar to the cassette-type platform shown in FIGS. 2(a) and 2(b).

The cassette type platforms 2, 2 shown in FIGS. 8(C) and (A) configured as described above are installed at the molten metal receiving position 18 in the center of the tundish as shown in FIGS. 8(a) and (b). (C) and (d) are arranged alternately symmetrically in the longitudinal direction, and fixed in the tundish in the same manner as the method of fixing the cassette-type platform of the modification shown in Fig. 7 above. be.

The molten metal injected from the ladle into the molten metal receiving level 218 flows into the space 3 as shown by the arrow in FIG. 8(a).
0.31, the flow bends through the tundish nozzle 19.1 provided on the bottom wall of both longitudinal ends of the tundish.
From 9, it is poured into a mold (not shown).

It took about 30 minutes to attach the conventional weir shown in FIGS. 9 and 10 to the tundish for storing the molten metal 65, but the weir shown in FIGS. 2, 4, 5, and 10 according to the present invention When a cassette-type podium as shown in FIGS. 6, 7, and 8 is used for a tundish of the same capacity, the installation and removal times were each significantly shortened to approximately 5 minutes. In addition, FIG. 2 according to the present invention.

The cassette type platform shown in Figures 4, 5, 6, 7, and 3 does not collapse or float during the casting period (the effect of cleaning the molten metal lasts), just like conventional weirs. It was done.

<Effects of the Invention> The cassette-type platform according to the present invention differs from conventional brick-built weirs and weirs in which precast blocks are fixed inside the tandish with mortar or special bricks so that they are integrated with the side walls and bottom walls of the tandish. , has the following effects.

■ It can be integrally molded or assembled in advance, and there is no need to integrate it with the side wall or bottom wall of the tundish, making it extremely easy and quick to attach and remove it from the tundish.

■ Therefore, it is possible to respond in a short time to changes in the weir type of the tandish that are suddenly required due to unplanned changes in the cast steel type, etc., and the number of spare tundish can be reduced.

■ Easy to install and reinstall after use, compatible with any type of cast metal, easy to reuse, eliminates waste of refractories, and reduces overall running costs for tanditshu refractories. .

■ There is no collapse or floating during casting, and the cleaning effect of the molten metal does not deteriorate.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment according to the present invention, in which (a) is a plan view thereof, (b) is a cross-sectional view taken along A-A in (a), and (C) is a cross-sectional view taken along B-B in (a). 2 is a detailed view of the cassette platform according to the present invention, (a) is a front view, and (b) is C of (a).
3 is an explanatory diagram of another modification according to the present invention, (a) is a plan view thereof, and (b) is a plan view of (b) of (a).
D cut cross-sectional view, (C) is a cut E-E cross-sectional view of (a), FIG. 4 is a front view of the cassette-type platform of FIG. 3, and FIG. 5 is a cassette-type podium of another modification according to the present invention. FIG. 6 is a detailed view of the platform, (a) is a front sectional view thereof, (c) is a GG line view of (a), and FIG. 6 is an explanatory diagram showing still another modification according to the present invention. ,(
(a) is a plan view thereof, (b) is a JJ cross-sectional view of (a),
(C) is a cut cross-sectional view of (a), (d)
is a sectional view taken along L-L'-L' of (a), and (e) is (
It is a MM, M'-M' cross-sectional view of a). FIG. 7 is an explanatory view showing still another modification according to the present invention, in which (a) is a plan view thereof, ((a) is a sectional view taken along the line N--N of (a), and (C) is (
a) P-P, P'-T", P'-P", P'"-P
8 is an explanatory view showing still another modification of the present invention; (a) is its plan view, (b) is the R of (a)
-R cross-sectional view, (C) is s-s of (a), s'-s'
, s'-s", s=-s" cut cross-sectional view, ((support) is (
It is a TT and T'-T' cross-sectional view of a). FIG. 9 and FIG. 1θ are both explanatory diagrams of a conventional Tanditsh weir, where (a) is a plan view and (b) is a cross-sectional view taken along line X-X and line Y-Y. 1... Tanditshu - 1a... Tanditshu side wall, lb... Tanditshu bottom wall 1 2... Cassette type platform, 3... Weir temporary, 3a,
3c... Side face of weir plate, 3b... Bottom face of weir plate, 4...
Weir plate bottom notch (flow path), 5... Head fixing support beam member, 6... Tanditsu side wall notch guide, 7... Tanditsu iron skin, 8... Reinforcement reinforcing bar, 9...・Hole (flow path),
lO... Support hardware, 11... Cooling fluid supply pipe, 12... Cooling fluid discharge pipe, 13... Cooling fluid partition plate, 14... Port, 15... Nut,
16... Spacer, 17... Cooling fluid partition plate gap, 18... Molten metal receiving position from ladle, I9... Tundish nozzle, 20... Cylinder (through hole),' 21...Small diameter through hole, 22...Lower weir, 23...Upper
Weir, 24... Tunnel, 25... Porous weir, 26... Shinga pile part for fixing the porous weir. 27... Center notch at the top of the weir plate (overflow channel)
, 28... Weir plate lower space (channel), 29... Weir plate upper side notch (overflow channel)
, 30... Space on the side of the weir plate (flow path), 31... Space between the sides of the weir plate (flow path), Patent applicant: Kawasaki Steel Corporation, Figure 1, Figure 2, Cb). ” Figure 4 Figure 5 Figure 6 <b> Figure 6 (e> Figure 7 (b) (c) <d) Figure 8 (b) (C) (d) Figure 9 <a> ( b”) Figure 10 (O) (b>

Claims (1)

[Claims] One or more weir plates provided to form a molten metal flow path together with at least a portion of the inner bottom surface of the tundish when placed in the tundish, and fixedly supporting the heads of these weir plates. A cassette type weir for a continuous casting tundish, which is made up of a head fixed support beam member, which is fixed to the tundish through fixed support parts on the upper part of both side walls of the tundish, and can be detached from the tundish.