JPH0137808Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is applicable to a twin mold for continuous casting in which, for example, a pair of short walls and a core are sandwiched between opposing long walls. It's about structure.

(Prior Art) In order to further improve the productivity of the continuous casting method, twin casting using twin molds has come to be adopted in recent years.

By the way, the core constituting the twin mold used in conventional twin casting is a block 1 made of ordinary steel with copper plates 2 on both side walls, as shown in Fig. 5.
A structure with attached is used. In this case, the means for fixing the block 1 to the long side walls 4, 4 of the twin mold 3 is to provide a through hole 5 in the block 1, insert a through bolt 6 into the through hole 5, and fix it using a nut 7. The method is adopted. Therefore, in such a core, it is difficult to make the width, that is, the distance l between the two copper plates 2, less than 300 mm due to strength problems caused by the through holes 5, the cooling slits 8 provided in the copper plates 2, etc. It was hot.

(Problems to be Solved by the Invention) By the way, the width of the core mentioned above has a large effect on the total width of both slabs drawn from the twin mold 3. In other words, when the width of the core increases, the total width of both slabs pulled out from the twin mold 3 also increases, and accordingly, the roller apron, pinch roll, etc. that guide both slabs becomes larger. The problem was that it had to be designed to be large, which increased construction costs.

(Means for Solving the Problems) The present invention attempts to solve the above problems by creating a structure in which the width of the core constituting the twin mold can be made smaller compared to the core of the conventional structure. It is something.

That is, the present invention provides a core for a twin mold for continuous casting, in which the core is formed into an integral structure made of copper with required cooling holes provided inside, and
On both sides of the core facing the long side walls of the twin mold, a shoulder portion that comes into contact with the mold plate on the inside of the long side wall and a convex portion that fits into a recess provided in the long side wall are formed; An appropriate number of screw holes with approximately the same length as the length of the protrusion are screwed into each side of the protrusion, and the protrusion on both sides of the core and each long side wall are individually bolted together. The main point is that

(Example) The present invention will be described in detail below based on an example shown in FIGS. 1 to 4.

In the drawings, reference numeral 11 indicates a core in the twin mold according to the present invention, and the core 11 is integrally formed using, for example, copper. As shown in FIG. 2B, this core 11 is provided with an appropriate number (three in this example) of cooling holes 12 in two rows on the side wall surface facing the short side of the slab. Yes, these 2
These cooling holes 1 are located approximately in the middle of the 12 groups of cooling holes in the row.
A water supply hole 13 and a drainage hole 14 that communicate with the second group are
It is provided perpendicularly to the group of cooling holes 12 and passing through the core 11 .

Reference numeral 15 designates fitting convex portions formed on both sides of the core 11 on the side facing the long side wall 4 of the twin mold 3 and the mold plate 4A provided inside thereof. Positioning of the mold 3 in the longitudinal direction is performed. The width of the fitting protrusion 15 is smaller than the width of the core 11 (L in FIG. 3), and the shoulder 15A of the fitting protrusion 15 is located on the mold plate 4A on the inside of the long side wall 4. It is designed to be applied to It goes without saying that a recess that fits into the fitting convex portion 15 is provided at a predetermined position on the long side wall 4 of the twin mold 3.

16 is the long side wall 4 of the core 11 and the twin mold 3
The screw hole 16 is parallel to the water supply hole 13 and the drainage hole 14, and the screw hole 16 is parallel to the water supply hole 13 and the drain hole 14, and
The required length is screwed from each side between the 14 holes. That is, in the core 11 according to the present invention, the fitting convex portion 15 positions the twin mold 3 in the longitudinal direction, and the bolts 17 and screw holes 16 position the twin mold 3 in the height direction with respect to both long side walls 4. positioning. In this case,
Consideration must be given, such as interposing a member in the bolt 17 portion of at least one long side wall 4 to absorb thermal expansion during pouring of molten steel. In addition, although not shown in the drawings, in this embodiment, when an external force is applied by a means for changing the distance between both long side walls 4, 4 of the twin mold 3, for example, a hydraulic cylinder device, a means for absorbing this displacement is provided. For example, it is necessary to provide a buffer or a cylinder device to the fastening member such as the bolt 17.

In this embodiment, the water supply hole 13 and the drainage hole 14 are provided penetratingly through the core 11, but the present invention is not limited to this, and as shown in FIG. Of course, it is also possible to provide the same.

(Effects of the invention) As described above, the core according to the present invention has an integral structure made of copper and is connected to the long side walls of the twin mold by bolts from each long side wall, which is different from the conventional method. The overall width can be significantly shortened compared to the core. Therefore, the total width of both slabs drawn by the twin molds becomes smaller, and accordingly, the roller apron and pinch rolls can also be made smaller. This means that the diameter of the pinch rolls can be made smaller, which makes it possible to reduce the roll pitch, thereby making it possible to reduce the bulging of the cast slab, which is an extremely great idea as it has the benefits of improving quality.

By the way, by adopting the structure of this invention, it became possible to reduce the width of the core from the conventional 300 mm to 100 mm. Furthermore, in the present invention, the shoulders of the fitting protrusions formed on both sides of the core are brought into contact with the mold plate on the inside of the long side wall, so that the contact between the mold plate on the inside of the long side wall and the core is In addition to being able to maintain a good butting condition at all times and smoothly forming a molten steel shell without using a hot water jug,
Screw holes with approximately the same length as the mating protrusion are screwed from each side on both sides of the core, so even if two rows of vertical cooling holes are provided inside the core, these vertical cooling holes can be screwed from each side. The width of the core can be made as thin as possible (smaller) without disturbing the holes.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a core according to the present invention installed in a twin mold, Fig. 2 is an embodiment of the core according to the present invention, and A is a side view and a central vertical sectional view. Figure 3 is an enlarged plan view showing the fitting part between the core and twin mold according to the present invention, and Figure 4 is a drawing similar to Figure 2A, showing the water supply hole and drainage. FIG. 5, which shows another embodiment of the hole, is a drawing in which a conventional core is installed in a twin mold. 3 is a twin mold, 4 is a long side wall, 11 is a core, 1
2 is a cooling hole, 13 is a water supply hole, 14 is a drainage hole, 15
16 is a fitting convex portion, 16 is a screw hole, and 17 is a bolt.

Claims (1)

[Scope of utility model registration request] In the core of twin molds for continuous casting,
The core is formed into an integral structure made of copper with required cooling holes provided inside, and both sides of the core facing the long side walls of the twin mold are brought into contact with mold plates inside the long side walls. A convex portion is formed to fit into the concave portion provided on the shoulder portion and the long side wall, and a screw hole having approximately the same length as the protrusion length is provided in the fitting convex portion from each side, and the core is inserted into the convex portion. A core for a twin mold for continuous casting, characterized in that convex portions on both sides of the core and respective long side walls are individually connected with bolts.