JPH0451011Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a continuous casting mold with excellent uniform cooling function.

<Prior art> A four-sided assembly mold for continuous casting has a pair of long side blocks placed at an interval corresponding to the thickness of the continuous cast piece, and a pair of long side blocks placed at an interval corresponding to the width of the continuous cast piece. It consists of a pair of short side blocks arranged and sandwiched between the walls of the long side blocks. In such a mold, a cooling box is attached to the back side of the mold body, which is usually made of copper or a copper alloy such as deposit-hardened copper, with fastening bolts, and cooling water is passed between the two. . By the way, when fixing the mold body and the cooling box with fastening bolts, the bolts used are made of a steel material such as stainless steel in view of its strength, and have significantly poorer thermal conductivity than the mold body, and also have a certain degree of heat conductivity. Because bolts with large diameters are required, for example, as shown in FIG. 6, the distance between the cooling water conduction slits 13 cut into the back surface of the mold body 12 is smaller in the areas where the bolt holes 11 are located than in other areas. It has to be big. As a result, since the intervals between the cooling water conducting slits 13 are large and the bolt holes 11 have poor thermal conductivity, during operation, the surface of the bolt part is exposed to other parts as shown in FIG. 7, for example. The disadvantage is that the temperature becomes higher than that, and the temperature distribution on the surface of the mold body 12 becomes uneven, resulting in uneven inflow characteristics of the lubricant (powder) interposed between the mold and the slab depending on the position. The disadvantage is that the quality of the slab deteriorates due to uneven heat removal, and the damage to the copper plate material or coating in areas where the temperature is high is more significant than in other areas.

As a countermeasure to overcome these drawbacks, a mold was proposed in which the depth of the slit 13 that sandwiched the bolt hole 11 was made larger than the others, and the bolt part was cooled more excessively than the others, as shown in Figure 8. However, in this type of mold, l ₁ <l in FIG. When the surface becomes rough, the number of so-called recutting operations in which the surface is cut and used repeatedly is reduced, and the problem that the life of the mold is shortened has resurfaced.

A conventional example of a continuous casting mold for the purpose of uniform cooling is disclosed in, for example, Japanese Unexamined Utility Model Publication No. 61-36341. This is a technology that attempts to solve the problem of insufficient cooling at the corners, and was also developed by
What is disclosed in Japanese Patent No. 57-49049 is a technique related to uniform cooling of two long sides using a profiling slit, and does not address the issue of cooling performance near the fastening bolt as described above.

In addition, as a conventional technique for cooling the vicinity of the fastening bolt, there is a hexagonal slit shown in Fig. 9, but as shown in Fig. 10, although this technology has a cooling effect around the fastening bolt, it has a cooling effect in the longitudinal direction. Since the slits are denser between the bolt pitches, the mold surface temperature becomes lower than that at the bolt portion, as shown in FIG. 11, causing a problem in mold surface temperature uniformity.

<Problem to be solved by the invention> The invention solves the problem of non-uniformity of temperature on the surface of the mold body due to the presence of bolts that connect the mold body and the cooling box, which causes other drawbacks. The purpose is to solve the problem without any problem.

<Means for solving the problem> In order to achieve the above object, the means adopted by the present invention are as follows. In other words, in a continuous casting mold in which a cooling box is attached to the back side of the mold body with cooling water conduction slits carved on the back side, the cooling box is connected to the mold body bored on the back side of the mold body. Between a pair of cooling water conduction slits sandwiching bolt holes,
Continuous casting characterized by having a straight or curved shape and having a bypass slit carved diagonally upward or diagonally downward from one slit to the other in the lower part of the bolt hole, and in the opposite direction in the upper part of the bolt hole. This is a mold for use.

<Function> The continuous casting mold of the present invention has cooling water conduction slits carved in a substantially straight line across the top and bottom of the back of the mold. Since there is a bypass slit in the direction of This is to maintain the mold surface of the fastening bolt part, which tends to become high in temperature, at the same temperature as other parts.

Figures 12 to 14 show examples of mold surface temperature analysis using the prior art hexagonal slit shown in Figures 9 to 11 and the present invention. The temperature was 12℃, but now it is 2℃
became smaller and more uniform. Furthermore, the temperature difference in the length direction, which was 9° C., has been made uniform.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a perspective view of a mold body according to an embodiment of the present invention viewed from the back side, and Fig. 2 is an enlarged explanatory view of the main parts. On the back surface of the main body 1, vertical cooling water conduction slits 2, 2, ... are cut, and fastening bolt holes 3, 3, ... are formed at appropriate intervals vertically at every required number of slits. is drilled. Bypass slits 4, 4, . . . are formed above and below this bolt hole 3. 3 is a sectional view taken along the line in FIG. 2, and FIG. 4 is a sectional view taken along the line in FIG. The depths of the bypass slits 3 and 4 were all the same.

Next, FIG. 5 is an enlarged view of main parts showing another embodiment, in which the bypass slit 4 has a gentle curved shape.

<Effects of the invention> Since the present invention is constructed as described above,
This produces the following effects.

When the continuous casting mold of the present invention is used for operation, when cooling water is flowed, the cooling water passes only through the cooling water guide slits carved in a straight line in the vertical direction in areas where there are no fastening bolts. In the area where the fastening bolt is located, cooling water flows not only through the slit but also through the bypass slit, so that the area around the bolt can be cooled more strongly than the other areas. Moreover, the bypass slit is
Since the depth does not need to be larger than that of the cooling water conduction slit, the mold body can be adjusted to a cooling degree that matches the diameter of the fastening bolt and its material without reducing the number of reworks. Even if the shape and size of the Therefore, it has the advantage that the temperature distribution on the mold surface can be made uniform.

[Brief explanation of the drawing]

Fig. 1 is a rear perspective view of an embodiment of the present invention;
The figure is an enlarged view of the main part, FIGS. 3 and 4 are cross-sectional views taken along lines - and -, respectively, in FIG. Figure 7 is an explanatory diagram of the main parts of a conventional mold. Figure 7 is an explanatory diagram of the surface temperature distribution of the same mold. Figure 8 is an explanatory diagram of the main parts of a conventional example for making the mold surface temperature uniform. Figure 9 is a conventional tortoiseshell-shaped diagram. The main part explanatory diagrams of the mold having slits, FIGS.
Figure 12 is an explanatory diagram of the main parts of the mold of the present invention, Figure 13
The figure and FIG. 14 are explanatory diagrams in which surface temperatures are plotted in cross-sectional views taken along line C-C and line D-D in FIG. 12, respectively. In the figure, 1... mold body, 2... slit for cooling water conduction, 3... fastening bolt hole, 4... bypass slit.

Claims (1)

[Scope of utility model registration request] In a continuous casting mold in which a cooling box is attached to the back side of the mold body with cooling water conduction slits carved on the back side, a fastening bolt between the mold body and the cooling box is drilled in the back side of the mold body. A pair of cooling water conduction slits sandwiching the hole have a straight or curved shape, and at the bottom of the bolt hole, one slit runs diagonally upward or downward from the other slit, while at the top of the bolt hole, the slit runs in the opposite direction. A continuous casting mold characterized by having a bypass slit carved therein.