JPS60141353A - Mold for horizontal and continuous casting - Google Patents

Abstract

PURPOSE:To obtain a billet having high quality by improving the combination of the mold walls of a casting mold combined with plural divided mold walls thereby enabling an increase in the size of the casting mold and eliminating the dimensional change of the casting mold by the effect of heat. CONSTITUTION:Respective mold walls 7 are so combined with each other that one edge end face 8 in the longitudinal direction thereof contacts with the wall surface 9 of the adjacent mold wall 7 near one edge thereof. At the tundish side end part 10, the corner angle part on the edge side in contact with the adjacent mold wall surface 7 is fixed to a mold frame 11 by means of a stopper 12. The respective walls 7 are therefore attached to the frame 11 slidable with the adjacent mold walls 7 always in tight contact therewith. The exertion of undue force between the mold walls is thus obviated even if the mold walls 7 expand or contract owing to a temp. change. Since there is no dimensional change in the mold, the sectional area of a billet does not change.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to an improvement of a molding 1 used for horizontal continuous casting.

(Prior art) Horizontal continuous casting has been put into practical use through the development of a break ring and the adoption of an intermittent drawing drive.

As mentioned above, the break ring is installed between the high temperature tundish nozzle and the mold wall which is cooled from the back side with a water cooling jacket, and it receives heat from the high temperature molten steel and cools from the mold wall, resulting in a very large heat load. Generally, it is formed in the form of an integral link, and extremely severe taper processing is required at the contact area to reduce the contact ratio of the sealing part with the mold wall, and the material is When assembling at room temperature, it is necessary to use a method such as press fitting or shrink fitting to prevent gaps from forming at high temperatures between mold walls of different sizes.

Furthermore, there is a limit to the manufacturing size of integral ring-shaped break rings, and it is currently difficult to make very large ones. However, in order to cast slabs with large cross-sections, it is possible to use large ring-shaped flak rings. However, during casting, a gap is likely to be formed at the taper joint between the end face of the mold wall and the break ring due to the difference in expansion coefficient, resulting in leakage of molten steel.

Figure 1 is a sectional view of the main part of a mold in a conventional horizontal continuous casting facility for casting polygonal slabs, and Figure 2 is a cross-sectional view of the main part of a mold in a conventional horizontal continuous casting facility for casting polygonal slabs.
It is a sectional view along the -a line.

In the figure, 1 is a tundish nozzle, 2 is a tamp push nozzle, and 3 is a mold wall divided into a plurality of parts connected to the tandish nozzle 2 with a nozzle ring 4 and a break ring 5 interposed therebetween.

In the above, the mold surface is formed by a plurality of separate and independent mold walls 3 on each side (four-wall configuration in the embodiment), but the break ring 5 is partially ring-shaped,
The joint surfaces of both are processed into a Taber surface 6.

However, as shown in Fig. 2, in this conventional type, the edges of each mold wall 3 are configured to push each other against each other. There is a drawback that the dimensions change, and even if this divided mold wall 3 undergoes thermal expansion due to temperature changes in practice, it will not fit together if it is forcibly pressed against each other. At present, it is only applicable to a size that does not create a gap due to thermal expansion when bonded to 5, that is, a cross-sectional area smaller than the size of the slab.

Generally, copper or copper alloy with good thermal conductivity is used for the walls of this type of mold, and ceramics with good high temperature strength and spoke ring resistance are used for the break ring, so naturally their coefficients of thermal expansion are different. .

(Example) For a 3001m x 3001 slab, linear expansion coefficient Amount of thermal expansion (dragon) Mold 18 x 10' / ℃1.62/, at
300 "C(14) Bl+Ring 1.Oxlo-6/"c O,24/a
t800 'C(BN) BR ring 2.5 XIO' / 'CO,60/a
t800'C (Si3N4) However, BR ring: Break ring, that is, a combination of copper and BN, 1.38 dragon, paulownia and Si3N
In combination with 4, a gap of 1.02 fins will be created.

These gaps cause F4 steel leakage and deterioration of the surface quality of the slab.

(Objective of the Invention) The present invention has been made in view of the above points, and the mold surface is formed by a combination of a plurality of split mold walls, but these mold walls cannot be pressed against each other due to thermal expansion. There is no gap, etc., even if the break ring is made of different materials and has a different coefficient of thermal expansion, and there is no gap, etc., making it possible to increase the size of the mold and reduce thermal expansion. The objective is to provide a high-performance horizontal continuous casting mold that can provide high-quality slabs with constant dimensions and no dimensional changes within the mold due to the above-mentioned problems.

(Structure of the invention) Embodiments of the present invention will be described below with reference to the drawings.

Fig. 3 is a Wr side view of the main part of the mold in horizontal continuous casting equipment showing an embodiment of the present invention, Fig. 4 is a side view of the mold along line b-b in Fig. 3, and Fig. 5 is a mold wall. FIG. 6 is a partially sectional view showing another embodiment of the break ring.

In the figure, the same reference numerals are used for parts common to FIGS. 1 and 2.

This invention is similar to the conventional type in that the mold surface is formed by a plurality of separate and independent mold walls 7 (four-wall configuration in the embodiment).

Each mold wall 7 of the present invention is assembled in such a way that its single edge surface 8 is in contact with the mold wall surface 9 of the adjacent mold wall 7 near one edge in the longitudinal direction of the mold, and the tundish side end 10 is assembled. At the adjacent mold wall surface 7
The corner portion of the edge in contact with the mold frame 11 is fixed to the mold frame 11 with a 1F tool 12, and each mold wall 7 is slidably attached to the mold frame 1 in close contact with the adjacent mold wall 7.
1 (t4J), each mold wall 7 is configured to be expandable and contractible in the side direction and in the direction of drawing out the slab.

That is, as shown in FIG. 5, one corner of the mold wall 7 is fixed to the mold frame 11 with a stopper 12 at the end 10 on the Kundesosh side, and the mold wall 7 is expanded and contracted in the surface direction around this fixed point. It is something that can be done freely.

The break ring 13 of the present invention is provided on the mold wall surface 9 for each mold wall 7 along the tundish side end of the mold wall 7.

One end 14 of the break ring 13, that is, the corner end 14 on the corner side where the mold wall 7 is fixed to the mold frame 11, is fixed to the mold wall 7 by a latch 15, and the other end Mold wall surface 7 towards I6
A gap 17 is formed between the stopper L5 and the stopper L5 so as to be able to slide in close contact with the
C installation 4-.

In the figure, 18 is a water-cooling jacket attached to the mold frame 11, and 9 is a positioning groove provided on the joint surface of the back surface of the mold wall 7 with the water-cooling jacket eye 8, which is shown in Figure 5. They are provided along the tundish side end of the mold wall 7 and along the corner side edge fixed by the stopper 12, respectively.

FIG. 6 is a part 111 showing another embodiment of the brake ring.
In the i-plane view, a split type break ring I3 is provided on the mold wall surface 9 for each mold wall along the tundish side end of each mold wall 7, and one end of the break ring 13, that is, the mold A break ring end 14 on the edge side where the wall 7 is fixed to the mold frame li is fixed to the mold wall 7 by a stopper 15, and a gap 17 is formed between the break ring end 14 and the stopper 15 towards the other end. It is made to be able to slide in close contact with the mold wall surface 9.

(Operations and Effects) By configuring the present invention as described in -F, the following operations and effects can be achieved.

(1) Each mold wall having a split structure is assembled with each other so that one end surface of the mold wall is in contact with the mold wall surface near one edge of the adjacent mold wall in the longitudinal direction of the mold, and the tundish side end of the mold wall is In this section, only the corners near the edges of the mold walls in contact with the adjacent mold walls are fixed to the mold frame using fasteners, and each mold wall is always tightly slidably attached to the mold frame in the side direction and the slab drawing direction. No matter how much the mold wall expands and contracts due to temperature changes,
There is no unreasonable force acting between the mold walls, no gaps are created, and there is no dimensional change within the mold. Therefore, the cross-sectional area of the cast slab does not change and high quality slabs are produced. is obtained, and there is no restriction on the size of the mold wall, making it possible to cast large slabs.

(2) Only one corner of each mold wall is fixed to the mold frame with a fastener at the end on the side of the tandesh, and at the back side of the mold wall where it connects with the water cooling jacket, the end of the mold wall on the tandesh side Since we provided uneven stripes for positioning along the edge of the corner side fixed by the [H] tool, even if it can be freely expanded and contracted in the casting direction and the side direction perpendicular to it, The V degree of the connection with the tundish nozzle, which is affected by thermal expansion, can be maintained high against lightning, and it is easy to attach and detach when the mold wall wears out, making it easy to maintain, and the size of the slab can be changed. This makes it possible to increase the number of revisions without any trouble, and also enables the casting of slabs of different sizes using the same mold.

(3) Along the tandish side edge of each mold wall,
A split break ring is provided on the mold wall surface for each mold wall, and m11 part of the force of the break ring, i.e.,
The end of the break ring on the edge side where the mold wall is fixed to the mold frame is fixed to the mold wall with a tool 11, and the other end is tightly slidable on the mold wall surface with a gap between the break ring and the tool. Unlike conventional break rings that form a single annular shape, there is no need for tapered surface machining on the end of the mold wall, as well as on the break ring surface, and mutual plane joining is possible, improving joining accuracy. This improves the insertion of molten steel, prevents leakage, and extends the life of the mold.

(4) The break ring attached to each mold wall can also be used not as a single unit, but as a break ring that can be divided into multiple parts and combined. The break ring itself can be composed of break link pieces made of different materials, such as one made of a material with high wear resistance, and one made of a material with different linear expansion for adjusting the gap between the combined break rings, and partial replacement is possible. etc. becomes easy.

[Brief explanation of the drawing]

Fig. 1 is a wf side view of the main part of a mold for horizontal continuous casting equipment for casting conventional polygonal slabs, Fig. 2 is a sectional view taken along line a-a in Fig. 1, and Fig. 3 is a view of the present invention. FIG. 4 is a side view of the mold taken along line b-b in FIG. 3, and FIG.
The rear view of the wall, FIG. 6, is a partial sectional view showing another embodiment of the break ring. 1... Tanditshu, 2... Kunde? Soshnosul, 3...Moll I"ffl, 4...Nosullink, 5...Breakling, 6...Taba surface, 7...
- Mold wall, 8... Mold edge surface, 9... Mold wall surface, 10... Mold end, 11... Mold frame, 12... 1 (two tools, 13... Break ring, 14... Break ring end, 15... Stop, 16... Break ring end, 17... Gap,
18...Water cooling jacket. Figure 2, Figure 3, Figure b

Claims (2)

[Claims] (1) In a mold in which the mold surface of a horizontal continuous casting equipment for casting polygonal slabs is formed by separate and independent mold walls for each side, each mold wall has one side in the longitudinal direction of the mold. are mutually assembled so that their edge surfaces are in contact with the mold wall surface near one edge of the adjacent mold wall, and at the tundish side end ff1l, the corner portion of the edge side that is in contact with the adjacent mold wall surface is fixed to the mold frame. In addition, each mold wall is arranged in a mold frame so that it can slide in close contact with the adjacent mold wall and the seat, and each mold wall is configured to be expandable and contractible in the side direction and in the direction of drawing out the slab. A mold for horizontal continuous casting. (2) At the tundish side end of the mold wall, a divided break ring is provided for each mold wall, and the break ring is fixed to the mold wall at the corner side end where the mold wall is fixed to the mold frame. A mold for horizontal continuous casting, characterized in that the other end of the mold is slidably attached to the wall surface of the mold.