JPH0117408Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a mold for continuous casting.
In particular, it relates to a mold suitable for automatic width changing during casting.

As a mold for continuous casting, there is a prefabricated mold as shown in FIG.
The width of the slab can be arbitrarily set by interposing it and moving it forward and backward as shown by arrow A in the figure. Therefore, when changing the slab width during pouring, a minute gap (hereinafter referred to as
A "sliding allowance 3" is set, and if foreign matter such as powder on the surface of the molten steel enters into this sliding allowance 3 and the short side mold flask 2 is moved under this state, the sliding allowance 3 Scratches are caused on the long side mold flask 1 in the moving range l, and the life of the mold is shortened.

Therefore, conventionally, during preparation for casting, the sliding allowance 3 was slightly widened and the mold was thoroughly cleaned before changing the width of the slab.

However, in recent years, automatic width changing technology during casting has been developed to improve yield and save energy.
When changing the width during casting, it is physically impossible to perform the above-mentioned cleaning, and as shown in FIG. Scratches B occur over the range of movement.

The present invention was devised under the above circumstances, with the purpose of providing a long-life continuous casting mold that can prevent scratches as much as possible even when width changing operations are performed during pouring, and its features are as follows: In a continuous casting mold in which a short side mold flask is fitted between long side mold flasks that are arranged facing each other and is slidable under a predetermined sliding allowance setting, The surface width of the sliding contact surface of the short side mold flask is made as thin as possible, and a concave stepped portion for foreign matter to fall is formed on the open side of the short side mold flask, and a concave stepped portion is formed on the open side of the concave stepped portion. Another feature is that a scraper which is pressed against the long side mold flask is provided so as to protrude over a height corresponding to the total height of the long side mold flask. Hereinafter, the present invention will be described in detail based on the illustrative drawings from FIG. 3 onwards.

Fig. 3 is a plan view showing one embodiment of the present invention;
The figure is a sectional view taken along the line -- in FIG. 3, and FIG. 5 is an enlarged perspective view of the short mold flask 2 shown in FIGS. 3 and 4.

1a is a long-side mold flask on the fixed side, and 1b is a long-side mold flask on the free side.The facing distance d between both long-side mold flasks 1a and 1b is adjusted by the amount of screwing of the nut 5 with respect to the tie bolt 4. 1c, 1c are the mold flasks 1 on both long sides
A mold copper plate fixed to each facing surface of a and 1b, 6 a sliding shaft protruding to the open side (left side in the figure) of the short side mold flask 2, and 7 a fixed side shaft to support the sliding shaft 6. The bearing is projected from the long side mold flask 1a to the free side long side mold flask 1b, and 8 indicates a disc spring fitted onto the tie bolt 4.

Further, 2a is a back frame that constitutes the open side (left side in the figure) of the short side mold flask 2, and 2b is a mold that constitutes the front side (right side in the figure) of the short side mold flask 2, in other words, the molten steel compartment side. The mold copper plate 2b is made of a copper plate, and a slit 2c for conducting cooling water is formed in the mold copper plate 2b.

Then, the surface width a of the sliding allowance 3 forming portion of the short side mold flask 2, that is, the sliding contact surface of the long side mold flasks 1a and 1b, is made thin as shown in the figure, and a recess is formed on the open side of the thin wall portion 9. A step part 10 is provided, and a scraper 1 is provided on the open side of the recessed step part 10 and is urged from the back frame 2a to the long side mold flasks 1a and 1b.
1 are installed vertically over a length corresponding to the total height h of the long side mold flasks 1a, 1b. Further, 12 is a spring for urging the scraper 11, and 13 is a spring 1.
2 Shows the vertical groove for accommodation.

Here, the surface width a of the thin portion 9 is the width a of the thin portion 9.
The area (amm x hmm) of the long side mold flasks 1a, 1b
The area may be set so as to withstand the surface pressure (Kg·f/mm ² ) generated by the pressing force, and specifically, it is determined by the specifications of the molding equipment. Further, the scraper 11 and the spring 12 are selected from materials that have elasticity, heat resistance, and water resistance.For example, as the spring 12, SP3, SP4
Spring steel such as
MC nylon, silicone-based synthetic rubber, fluorocarbon rubber, etc. are used.

The present invention has the configuration as exemplified above, and has a function that can sufficiently withstand even if automatic width change is performed during casting.

That is, in the mold of the present invention, first, the part of the short-side mold flask 2 that constitutes the sliding allowance 3 is made into a thin wall part 9, and when changing the width, the part that constitutes the sliding allowance 3 enters into the sliding allowance 3 and is present in this part. The amount of foreign matter becomes small, and when the short side mold flask 2 further advances toward the molten steel side, the foreign matter present in the sliding allowance 3 is removed by the concave stepped portion 10 formed on the open side of the thin wall portion 9.
appears and falls downward at the recessed step portion 10. Further, the copper plate 1 at a position facing the concave stepped portion 10
Adhesive foreign matter that continues to adhere to c is scraped off by the scraper 11 as the short-side mold flask 2 further advances. Therefore, according to the mold of the present invention, the foreign matter is allowed to fall and be removed at the concave stepped portion 10, thereby eliminating the scratches B caused by the foreign matter that conventionally occurred on the surface of the mold copper plate 1c of the long-side mold flasks 1a, 1b. can be prevented as much as possible.

The scraper 11 also serves as a dust seal to prevent dust from entering the mold from the open side.

As explained above, the present invention makes the surface width of the sliding allowance component part of the short side mold flask as thin as possible and forms a concave stepped part on the open side of the thin wall part, so that the thin wall part can be opened. Foreign matter falls on the side, and in addition, a scraper is attached to the open side of the concave step, and the scraper scrapes off the viscous foreign matter.
As a result, foreign substances such as powder are removed one after another at the concave steps, and the scratches that conventionally occur can be prevented as much as possible, extending the life of the mold, and automatically widening the mold during pouring. It is extremely effective and suitable as a continuous casting mold that needs to be replaced.

Furthermore, the mold of the present invention in which the thin-walled portion is formed as described above also has the advantage that it is easy to create a perpendicularity between the long side mold flask and the short side mold flask, making mold maintenance and assembly easy.

[Brief explanation of drawings]

Figure 1 is a perspective view schematically showing an assembly mold for continuous casting, Figure 2 is an illustration of scratches caused by foreign objects, and Figure 3 is an illustration of scratches caused by foreign objects.
The figure is a plan view showing one embodiment of the present invention, FIG. 4 is a cross-sectional view taken along the - line in FIG. 3, and FIG.
It is an enlarged perspective view of the short side mold flask shown in the figure. 1a and 1b are long side mold flasks, 2 is short side mold flask, 3
9 is a sliding allowance, 9 is a thin wall portion, 10 is a concave stepped portion, 11 is a scraper, 12 is a spring, and a is a surface width.

Claims (1)

[Scope of utility model registration request] In a continuous casting mold in which a short side mold flask is fitted between long side mold flasks that are arranged facing each other and is slidable with a predetermined fitting distance set, The surface width of the sliding contact surface of the short side mold flask is made as thin as possible, and a concave stepped portion for foreign matter to fall is formed on the open side of the short side mold flask, and a concave stepped portion is formed on the open side of the concave stepped portion. A mold for continuous casting, characterized in that a scraper is pressed against the long side mold flask and protrudes over a height corresponding to the total height of the long side mold flask.